If your coach was made by EMC, between 1986/1988 there are no found sources that I know of that can supply "specific" parts made by them for the body or interior. Most inside trim parts were "exclusive" for their models. Basic RV parts used by them such as appliances and switches, latches, hinges, etc. are pretty much standard today, and still available at most RV suppliers. What particular parts are you looking for?
Yes
Parts for a Cadillac Eldorado can be purchased through many retailers. NAPA Autoparts and Auto Parts Warehouse both offer many Cadillac Eldorado parts.
Yes
Built in the fan blower/motor.
Most drivetrain parts and some body parts are interchangeable, the largest issue being the larger bumpers on the '73 vs the '72.
You can purchase a manifold and fuel rails for a 1993 Cadillac Eldorado 4.6 Northstar motor from various online retailers such as RockAuto, eBay, and Amazon. Additionally, specialty auto parts stores or salvage yards may have these components available. For OEM parts, consider checking with a Cadillac dealership or websites like GM Parts Direct. Always verify compatibility with your specific model and year before purchasing.
You have to drop the subframe
Drivetrain parts and some interior pieces are interchangeable.
sounds like a defective blower module
No, they are 2 totally different bodystyles
replace that black box on the wiper motor or sometimes you have to replace the motor itself
I believe the starter motor sits in the galley under the intake manifold.