1999 BMW 540 bmw 540it (with self leveling) rear shocks

Hi there!

I can't seem to find a company that carries rear shocks for the 540it with the rear air suspension. I know that the dealer will sell me brand spanking new Sachs, but I know that I can find a better deal elsewhere. Can you tell me if the shocks are the same for the sedan and the wagon for the e39 V8.

Thanks in advance