Cab roof lights

So i go to put the new one i order on ebay recon 88-2001 and i didnt relize there was suppose to be a rubber peace under it.. where would i get that at?

dealer

you might even get lucky and find them at like a advanced or Oreilys, or something but most likey the dealer and take some vaseliune with ya cause their gonna rape you on the price, i bought a new airdam to go under the front bumper and they bitch was 48 bucks for a new one and it is plastic.. lmao

hell i bought whole light kit from lmc and it came with everything it was only$60