anyone know where to get the exact oring for the FPRV I bought some at carparts,napa and autozone none are the right size..and of course through gm you have to buy a new FPRV to get the oring which costs about 500 bucks so with that anyone know where or have one? this leak is driving me nuts and yes i've tightened it to the point of almost falling off the truck i'm pullin on it so hard