I ordered coil springs under Delco part number 45H1139. I'm sending those back because Amazon's shipping isn't exactly perfect. 45H1139 springs must be a general w-body replacement sold in pairs, judging from RockAuto's fitment thing.
Clicking around on GMpartswhatever, I found a part number for FE3 springs 22133030.
I also got one for FE4 springs, which go over the Bilsteins 15782420.
1) Guess my first question is, would the FE4 springs fit on FE3 struts with the appropriate seats? Which seats would be used, if so? That's pretty hypothetical because we think FE3 is rather firm already, tbh.
2) Otherwise, would you bother with the separate and more expensive springs sold from GM, 22133030? Or would you just go with the cheaper pair, 45H1139?
I'm swapping over to the "old" style arms and sway. Kinda looking forward to it. Thanks!
