Seats will require some custom work on the tracks. Mk3 seats are really heavy and aren't as comfortable as Mk2 seats so I'd avoid 'em. Steering wheel can be made to fit. You need to do some custom work to get the horn to work correctly and also wire the cruise buttons to work if you want them to. The 89 wheel is the one to get. 87/88 are butt ugly IMHO and the later years had airbags.