I've used bmminiparts in the past for parts (namely brakes for my E46 M3) - they seem to have a range of E36 parts and normally a good chunk cheaper than Main Dealer prices.
Did you have any luck? I need to replace the N/S on my 3.0. Was hoping I could just replace the bush as per all other E36 models as there is a bit of play been picked up on the MOT but seems I have to get the whole arm
I've got mine booked in at mvt in holton heath near wareham in dorset. They can suppl6 and fit them pretty reasonably. Not used them before so bit nervous but hopefully theyll be ok.