I have a set of 600lb rear TcKline springs from my M3 to sell. They go for $100 each new.
So I'm asking $160 for the set.
These are 60mm, around 7" tall and can be used with or without adjusters. If you're looking to lower the rear of your car or stiffen it up, these will do the trick.
They look just like the picture shown, much smaller than stock. Picture shows 400lbs but is just for reference.