For an e-bay find you need wait until they are available.

For salvage yards, the best bet is to look in your yellow pages for one near you.
You may need to wait for a doner E class to arrive at the salvage yard, in the meantime will a spring work?

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles