I just had the passenger side rear trailing arm just failed, cracked.

I drive a 300td (wagon), can I use the same trailing arm from a sedan, or do I need one expressly for the wagon?

If not, I can't find a trailing arm for sale new, anybody know a good source for finding one?

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1982 300TD 300,??? miles, daily driver turned donor
1982 300TD, 184,000 miles, daily driver