Identical parts, sourced from different suppliers so they can track warranty claims separately?now i can change them an so can many others that havent had luck finding the 663. What's funny is the gm website contradicts what gm says. When you click vehicle fitment for the 664 part number it says it fits all models basically. Says if fits the yukon which is what I have. And when I click the 663 vehicle fitment it also says it fits every model even the diesel 2500. Someone at gm messed up on that one.
Ok. That would be new to me. All the rubber or Poly bushings I've used, squeeze out when tightened.Shurkey, those end link bushing do not squeeze out like rubber bushings, they are almost like nylon.