I'm circling back around to my project. Where did you find the ACDelco Professional part numbers? They aren't matching anything I can find online. I need the RWD but I can't find these parts anywhere. If I can't find the GM or ACDelco equivalent, does anyone have recommendations for other spring brands?I show 20842478 for 6EA and 7EA springs which show as discontinued for GM OE from GMPartsGiant.
They are available as ACDelco Professional 88875301/45H0453 for AWD and 88875302/45H0453 for RWD.
Definitely replace your jounce bumpers and the strut mount, all the parts that make up the strut, including the nut.