Having spent a fruitless two hours trudging around car part shops in South London I did the sensible thing and ordered the parts from RS. It'll be here on Monday with luck, and was much less hassle. I should get on with some of the other jobs, but I'm quite frankly not in the mood at the moment and any work on swapping the wheels around is worthless because I can't take her out with the exhaust hanging so precariously.