Tail Light Swap, needing harness with sockets!!

okay guys, does anyone know where i can find a harness with sockets for this led tail light?? this bulb socket wont fit on the factory led's tail lights pictured up there^ it's like the grooves are too small to fit the socket because i twist and turn it and it just doesnt fit. but they fit on the all red base model tail light (thats what my truck came with) and i had bought these factory led's ones bc i like them better but it didnt come with the sockets or harness on them because i thought i could reuse mine..