Aftermarket seats in a MK2 2 door

[Spyda]

How hard would it be to fit MK4 GTI seats??

There is a DIY on vortex. Its not to hard but the runners on the front seats need to be cut and welded about 2" inward and the wheels on the mk4 runners need to be grinded to fit. The rear seats are fairly easy but you need to cut the mounts out of the mk4 and weld them in to the mk2 or you will need to custom make some stuff.