I replaced my rears with Bilstein comforts I bought through Adsitco. Very satisfied with both the shocks and the transaction. They were the cheapest for me....

It was labor intensive (time only) Taking out the seat, uninstall and reinstall for both probably took me about 2 1/2 hours solo....

You need a high jack or a jack with blocks to raise the car high enough for clearance to drop the shocks out of the bottom....Didn't need any special tools, but my mini vise grips broke messing with the top nuts on the shock...

There are good writeups here if you search.

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85 300CD Turbo "Das Polluter" 230K sold for $3,000

98 BMW 323is