I was wondering if there was a company that makes the 2002 style tail light that has the side marker socket? Or if anyone has modified one as in they maybe drilled a hole into the back of the tail light and JB Welded a socket off a donor tail light from a 2003.5 to a 2007.5?

Newer style (2006)

Older style (2002)

 

I used hole saw & universal lamp sockets to add lamps to existing tail lamp housings. I towed this truck behind a motor home many years, using the added bulbs while toad. A little silicon sealant kept out dirt & water.