{"product_id":"bosch-reflektor-1305314931-h4-scheinwerfer-links-mercedes-w123-s123-rund-nos-ovp","title":"Bosch Reflector 1305314931 H4 Headlight Left Mercedes W123 S123 Round NOS OVP","description":"\u003cdiv style=\"background:#242833;border-radius:8px;padding:18px 20px;margin:0 0 14px;color:#ffffff;\"\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong style=\"color:#c69a3a;\"\u003eBosch reflector insert 1 305 314 931 for the round H4 headlight, left, on the Mercedes-Benz W123\/S123.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;color:#cfd3dc;\"\u003eNOS – uninstalled in the original box  ·  For round H4 headlights  ·  \u003cstrong style=\"color:#c69a3a;\"\u003eFits W123 and S123 (up to 09\/1982)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f5f6f8;border-left:4px solid #c69a3a;border-radius:8px;padding:14px 18px;margin:0 0 16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;\"\u003eCondition of this part\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eNew old stock (NOS) in the original Bosch box with a historical address print (manufactured before 1993). The mirror surface shows no visible corrosion or scratches, only minimal storage marks; the H4 socket is complete with retaining springs. The box itself is dirty and yellowed from age, with a frayed top glue edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eFunction and location\u003c\/h3\u003e\n\u003cp\u003eThe reflector is the light-shaping heart of the headlight: the H4 dual-filament bulb sits in the socket at the apex of the chromed paraboloid, which focuses the low and high beam. Dulled or hazy reflectors are the most common cause of weak light on classics and a typical failure point at the German MOT (HU). Only the insert is replaced; the housing and lens are retained.\u003c\/p\u003e\n\u003cp\u003eIt is installed in the round main headlight at the front left, behind the lens; alignment is done via the adjusting screws of the headlight bowl.\u003c\/p\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eHow can you tell a reflector has dulled?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLow or high beam appears noticeably weaker even though the bulb itself is fine.\u003c\/li\u003e\n\u003cli\u003eThe light cone becomes diffuse or uneven because the mirror surface no longer focuses cleanly.\u003c\/li\u003e\n\u003cli\u003eThe vehicle fails the German MOT (HU) due to insufficient light output.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eCompatible vehicles\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eW123 sedan (up to 09\/1982):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e200\u003c\/li\u003e\n\u003cli\u003e200 D\u003c\/li\u003e\n\u003cli\u003e230\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eS123 T-model (up to 09\/1982):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e200 T\u003c\/li\u003e\n\u003cli\u003e200 D T\u003c\/li\u003e\n\u003cli\u003e230 T\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Bosch part number of this reflector is 1 305 314 931 (left version). For comparison, the counterpart for the right side carries the number 1 305 314 932.\u003c\/p\u003e\n\u003cdiv style=\"background:#f5f6f8;border-left:4px solid #c69a3a;border-radius:8px;padding:14px 18px;margin:0 0 16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;\"\u003e⚠ Important: compare the part number before buying\u003c\/p\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003eThis reflector is designed exclusively for the round headlight version with an H4 socket. The side assignment (left) follows the dealer catalog listing; the counterpart for the right side carries the number 1 305 314 932.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;font-weight:700;\"\u003eDoes not fit:\u003c\/p\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e280 and 280 E (wide-band headlights from the factory)\u003c\/li\u003e\n\u003cli\u003eCoupe C123\u003c\/li\u003e\n\u003cli\u003eVehicles with wide-band\/rectangular headlights (from 09\/1982 series)\u003c\/li\u003e\n\u003cli\u003eVehicles with headlight beam-height adjustment\u003c\/li\u003e\n\u003cli\u003eHella headlights\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this part fit your car?\u003c\/strong\u003e Send us the VIN (chassis number) and model year – we'll check it for free: \u003ca href=\"tel:+491798991069\"\u003e0179 8991069\u003c\/a\u003e (Mon–Fri 8 am–6 pm) or via our \u003ca href=\"\/en\/pages\/contact?thema=Ersatzteil\"\u003econtact form\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eDo I need to replace the entire headlight?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eNo, only the reflector insert is replaced. The housing and lens of the existing headlight are retained; the final beam-height adjustment should be carried out by a professional.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eDoes the reflector also fit square or wide-band headlights?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eNo, it is designed exclusively for the round headlight version with an H4 socket.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eWhat does NOS mean, and what is the condition of the box?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eNOS stands for an unused, new old stock part in the original box. The box itself shows storage marks from age – dirty, yellowed, with a frayed top glue edge – while the part itself is without visible corrosion or scratches.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRelated categories:\u003c\/strong\u003e \u003ca href=\"\/en\/collections\/w123\"\u003eW123\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKFZTeile-Thot\u003c\/strong\u003e specialises in spare parts for Mercedes classic cars. Free shipping within Germany, 60-day return policy.\u003c\/p\u003e","brand":"Bosch","offers":[{"title":"Default Title","offer_id":54984556347721,"sku":"90137","price":95.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0913\/5344\/8777\/files\/57_a7a42987-4ac4-4dde-a92b-4d9c7fe3418b.jpg?v=1787304475","url":"https:\/\/kfzteile-thot.de\/en\/products\/bosch-reflektor-1305314931-h4-scheinwerfer-links-mercedes-w123-s123-rund-nos-ovp","provider":"KFZTeile-Thot","version":"1.0","type":"link"}