I got Mr. Miked courtesy of my new wife
I have for sale, one nice condition seat bottom (Driver's side was trashed) and 2 pretty decent seat backs. The seat backs have had two pieces of foam removed (per Mr. Mike install), the lumbar shaped-piece and the smaller (4"x10") piece at about shoulder height. These can most likely be salvaged from your existing seat covers, just use a razor blade along the seams for them and use upholstery glue to attach them to the seat core.
I had to remove the listing wire (hold-down wire that you hog-ring to the seat core) from under the headrest on the drivers side seat cover because the PO replaced that one in the past and used way oversized hog rings that I could not remove properly. The passenger side was removed completely intact and remains such (minus the lumbar and shoulder foam as mentioned earlier).
The bolster sipes on both seat backs are in great shape, the driver's outboard sipe has 1 crack that you can barely see, and the passenger side one is split in one spot WAY down low that is hidden 90% of the time.
I'd like $30 + shipping or pickup if you're close (I could meet partway too, I spend a lot of time in the Cinci area, and I'm only an hour from Indy or Louisville, so I could make it a night out for dinner to meet another Fiero person).
Pics:
Seat bottom (orig from passenger side, basically perfect shape)
Passenger side seat back:
Driver side seat back: