[DaveNP]

Hi Chris, welcome on board.
I share your lack of enthusiasm over the can of snot and compressor idea. Unfortunately I've no idea over the replacement but could I suggest you check out the 'Trader's Offers and Discounts' section of the forum, you'll find FRF Motors thread as a sticky at the top, it's now a very long thread so I'd suggest read the first post and then go to the last post and work back a bit to get the correct contact details (by phone), they offer a good discount to forum users and are also knowledgeable and helpful, I reckon they would be able to sort out what you need.