I've got an '81 Diesel, Manual, Westy and a an opportunity for a '90, Gas, Auto, Vanagon.  Am wondering if anyone knows if any of the following with 'fit' the '81 without major modifications:

Seats (any, all)
Bumpers
Dash
Grill (either)
Carpet
Interior Panels

I'm about to take measurements in both but know there are several dimensions (size, shape, fittings, loads, et cetera) that I'll never be able to nail down before I buy the '90 and if anyone knows, from experience, that one of these parts above (or any for that matter) will or will not work, I'd appreciate it.

Neil