and the rears need machining to sit properly against the hub - I went to the place in person to make sure it all got done correctly and they were sound - should be able to do the same again without needing the car there.
They didn't seem to think the wheel bolts needed to be longer but i already had longer ones from an attempt to use crappy 10mm universal spacers.
Ive just been through this. The guy I got my teledials off told me they were the same offset as my GTV, they are not. The Tear drops are a 30.5mm offset and the 156 teledials are a 41.5 mm offset. They foul to the point that the car won't move, and the wheel man stripped three threads in the process. I'm not happy, and it wasn't worth the hassle. I'm gonna save up and get 17" with the correct offset! Hope this helps