are you talking about the polyurethane seat?
if so, then yes.
did the installation instructions come with your springs?
if not, MSS has their installation instruction pdf online.
it's easy and it ain't gonna cost much.
all you need is a gallon of HT-12, distilled water, and cleaner (if you really need to).
disconnect the lower hose in front of the driver's wheel well to drain the lower tank.
you'll need to bleed the cooling system once you've replaced the antifreeze.
I just reinstalled the jb4 and car would just die out at startup.....reminiscent of day one of the issue.
removed the jb4 and car started up normally.
failure of the jb4 is the root of the problem.
didn't think it would happen but....it did to me.
thanks for everyone's help!