New exhaust wont fit.

Im in a spot of bother. My exhaust was blowing so i bought a stainless manifold, pic below, but it doesnt fit to my standard middle pipe.

The bore is too big and its far too short. I think a part exists that will join the two up but i cant find it. The exhaust looks similar to an Ashley manifold but i could be wrong. Anyone got any tips?

hi there is a part on ebay that should help its under  mk1 golf parts and costs a tenner or there abouts,GAZ