Wemoto doesn't return any parts when I give the OEM number (Which I used Yamaha's online parts catalogue to get).
Fowlers won't give you prices online, you've got to call them with the VIN, engine and parts numbers, apparently - seems a bit odd to me, but hey.
Fowlers is probably a no-goer, since my main mission is to get my Dad back into bikes. Iif I have him dicking around with part numbers and crawling on the floor for the block number he'll just get pissed off, whereas if I can just get a box of bits sent over he can spanner away happily.