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The rear suspension has a ride height adjustment. If that didn't get your desired results, second move would be to replace the shocks with adjustable coilovers. This works well as the origional ride issue was solved by only adding 30lb to the spring rate of each side. It's inexpensive, simple, and offers adjustablity.
Now, if you want to completely change springs for racing or whatever reason, they are not BMW replacements. They are BMW springs, but have to be purchased by spring rates, not year-make-model. There are many BMW race parts dealers who sell them. Contact Reg for spring rates and application.
Hope this helps.
Boudy
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