{"product_id":"optronics-a45gb-4-round-light-grommet-black-pvc-open-back-replaces-grote-91740-peterson-b426-18","title":"4\" Round Light Grommet, Black PVC, Open Back | Cross Ref Truck-Lite 40700, Grote 91740, Peterson B426-18, Optronics A45GB","description":"\u003cp\u003eThis \u003cstrong\u003e4\" round light grommet\u003c\/strong\u003e is a black PVC, open-back, flush \/ recess-mount grommet for \u003cstrong\u003e4\" round lights\u003c\/strong\u003e. It is the standard grommet for mounting stop\/turn\/tail lights, backup lights and clearance lights in a 4\" round hole on trailers and trucks, and it cross-references to the \u003cstrong\u003eTruck-Lite 40700\u003c\/strong\u003e, \u003cstrong\u003eGrote 91740\u003c\/strong\u003e, \u003cstrong\u003ePeterson B426-18\u003c\/strong\u003e and \u003cstrong\u003eOptronics A45GB\u003c\/strong\u003e 4\" grommets.\u003c\/p\u003e\n\u003ch2\u003e4\" Black Light Grommet Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits 4\" round lights:\u003c\/strong\u003e a standard grommet for 4\" round LED and incandescent trailer lights\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen back design:\u003c\/strong\u003e lets the light connector and wiring pass through the back of the grommet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlush \/ recess mount:\u003c\/strong\u003e holds the light neatly in the mounting hole for a clean installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack PVC:\u003c\/strong\u003e flexible, durable grommet material that resists weather and wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRodoc stock number:\u003c\/strong\u003e TL-40700\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight size:\u003c\/strong\u003e 4\" round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e PVC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Open back, flush mount, recess mount\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCommon Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size lights does this grommet fit?\u003c\/strong\u003e It is made for 4\" round lights, such as the common 4\" round stop\/turn\/tail light.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this an open back grommet?\u003c\/strong\u003e Yes, the back is open so the light's connector and wiring pass through.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it in place of a Truck-Lite 40700, Grote 91740 or Peterson B426-18 grommet?\u003c\/strong\u003e Yes. It crosses to all of them, see the cross reference list below.\u003c\/p\u003e\n\u003ch2\u003eCross Reference: 4\" Black Round Light Grommet\u003c\/h2\u003e\n\u003cp\u003eThis grommet crosses to the following part numbers for 4\" round, black, open-back light grommets:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTruck-Lite:\u003c\/strong\u003e 40700, 40700-P (for 40 Series and 44 Series 4\" round lights)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrote:\u003c\/strong\u003e 91740, 91740-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeterson:\u003c\/strong\u003e B426-18, 426-18, 42618\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptronics:\u003c\/strong\u003e A45GB, OPTA45GB, OPTA-45GB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther interchange numbers:\u003c\/strong\u003e 01-00855, 103321, 9127, 9780040, LHTGR4000, LHLHTGR4000, MTGR4000\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDon't see your number? Contact Rodoc and we will help match the right grommet for your light.\u003c\/p\u003e\n\u003cp\u003eReplacing a light too? See our \u003ca href=\"\/products\/wilson-4-round-stt-light\"\u003e4\" round red LED stop\/turn\/tail light (Grote 53252 \/ Wilson APP03347I)\u003c\/a\u003e or the \u003ca href=\"\/products\/030-62835-timpte-clear-red-4-round-grommet-mnt\"\u003eTimpte 4\" round red clearance light\u003c\/a\u003e, or browse all \u003ca href=\"\/collections\/trailer-lights\"\u003etrailer lights\u003c\/a\u003e and \u003ca href=\"\/collections\/wiring-electrical\"\u003ewiring and electrical parts\u003c\/a\u003e.\u003c\/p\u003e","brand":"Optronics","offers":[{"title":"Default Title","offer_id":67624293957812,"sku":"TL-40700","price":2.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/7425\/5540\/files\/Screenshot2026-11-12114723.png?v=1794502172","url":"https:\/\/parts.rodoc.com\/products\/optronics-a45gb-4-round-light-grommet-black-pvc-open-back-replaces-grote-91740-peterson-b426-18","provider":"Rodoc Leasing Sales \u0026 Service ","version":"1.0","type":"link"}