help please, just need these few parts to get on the road.

Hi guys,  im near completion with my mk1 1.1L project but I only need these final few bits, but I've found it hard to find them in stock. The main bits im struggling to find is an exhaust middle pipe and back box and a front left calliper. I also need a full service kit which should be easy got but could anyone recommend somewhere that sells it as one or will I have to buy the service parts separate?
any help would be great, I'm also open to buying the parts second hand off of anyone on here who may have them and can post to northern Ireland asap