doubt much fits at all. obviously brakes and engines can be made to convert in but bumpers and panels....no.
for the rea brake on a mk2 - i wouldnt bother with those from a GT. get a beam from a Sporting or HGT that has rear discs as standard......should be a straight swap.
when i buy from scrap yards i try and go in with a list as you tend to get more for your money than if you pop in every few days buying nick knack parts. youll always pay more as they probably round the cost up.