I've picked up some parts along the way expecting that at some point I'll need them. That has held true for a couple of items already. I'd hardly part with an extremely expensive part for mere peanuts just for the sake of doing so. Especially when I paid more than was offered for the part.

Personally, I'd have a hard time buying a vacuum pump, or some such part, under the guise of it being something else...but that's me.

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Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000