Had my old gs550 done by a local locksmith a few years ago, he made new keys, just took the barrel into him as the numbers were worn,
Just find a good locksmith
Can't help with the part number sorry
But i do remember a mate got one by searching for Gs 1100 a few years back instead Gsx1100 some sort of Americanism
Hope it helps
I think there was or is a YouTube video of someone putting gsxr cams in the rf900, can't remember if it was a success!
I want to say 750n cams, but don't quote me
I believe its GA77A model code
R707 engine
If it says D my good tame mechanic says it could have been a grey import which were around a lot at the time
Shell still seem to have some e5 in most garages for the time being , just the cheaper supermarkets who have gone right over to the e10 or at least on the south coast