Im trying to replace taillights for 1986 cutlass 2door brougham - now I see alot of em on Ebay, expensive - but they all have small differences - some have wire on side - some dont - my question: when i look at my taillights, there is a little plug on the side of each one, with a little black wire coming in. Well, I honestly cant figure out what it s for, and when i see replacement taillights online , zoom in on them and many of them DONT have that extra little side wire and plug. I just wanna be sure when i buy because theres no return and they arent cheap - help from anyone would be appreciated, if someone knows what that wire is for, and if i buy taillights without that wire plug, will they work the same? thanks alot! dave ps - supposedly all the years are compatible, so why do some have theat little side wireplug and some dont?