First....awesome resource site.

Question...I found a 1984 2m4 Manual...low miles....new battery, struts, shocks, brakes, and tires and muffler...it has complete luggage rack that I need to replace...seats look nice..has cup holders in it...

It has been wrecked so they are motived....not sure about frame damage, or I would use the 86 as the donor...

How much interchangeability for my car...?? I need ebrake switch.....Other car has sunroof for interchangeability ..

Need to research before I buy and make wifey even madder after first fiero purchase...

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86 5 speed 2.5 Iron Duke

A lot of parts will interchange, however 84's do have a lot of differences. The electrical system is different, and the axles for the stick are 84 only. I had a heck of a time finding one for my 84. You may find some other things a long the way.