Palomino door panels come up on eBay all the time.

A national wreckers yard (Potomac, for instance) probably has them "in stock".

I replaced one of mine (1984 126 style) from a local wreckers for $75, so be patient.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)