i understand the early mk4 golf gti's had there diffs riveted and then they later changed to bolts. my diff rivets have sheared i believe so was wondering if you can bye a bolt kit to replace the rivets so i can repair rather than replace my box as this gearbox has only been in the car for about 6-8 weeks. its a 99 1.8 turbo engine code aug and gearbox code ecw!!