will the gas tank,wheels, seats and transmission from an 89 coupe fit a 93 vert? I know there are differences but i can't seem to find what exactly is different from 89-93 that i would have to worry about. I'm considering getting one for parts but I want to be sure the stuff will fit. If anyone knows(especially about the tank being able to fit) it would be much appreciated!

Yes, yes, yes and yes.

As far as I know, the only changes from the 89-90 and 91-93 were the nose, some trim, and the addition of the DOHC engine.

awesome, thanks!

the seats off the 89 will probably be 1 piece, and the seats off dohc models are all 2 piece (with a seperate headrest). They will all bolt up interchangeably (as will all S14 seats) but they do look different, so be prepared for that. sohc cars also came with different wheels, but as all s13s and non SE S14's used the same 4x114.3 bolt pattern and all had similar if not identical offsets, they will all bolt up. The gas tank should be identical on all models.

The transmission from a sohc car will physically bolt up to a dohc car but the sensors are different and not all of the plugs fit.