The euro lights use a 6 pin connector. If you can find a car in a junkyard, you can take the tail light connector and use that. I have some somewhere. I did a write up on how to do the conversion.

Where are your cars located? id be interested in some coupe parts.

How do the rear window seals look?
Doors?.. maybe

engine mount parts see: http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/351670-wtb-rare-78-om617a-engine-mount-parts.html

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"

I have read that the coupe seats are smaller then the sedan seats....so the cloth seats won't fit a sedan.

The lights on the 280 will have the needed connectors for the euro lights....they just switched a few pins around. I would switch all the wiring harness over for the head lights....this way you can take advantage of the fog lamp features and parking light features.

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You are correct. The coupe seats are different from the sedan/wagon seats.