2000 - 955i Chain And Sprocket Sets

Afternoon all ... me again ... Ive realised I need a new chain n sprocket set ... but... why cant I find one anywhere ? every one I see on the Bay of Evil is not like the one on my speedy .. the pic is showing what looks like a standard style sprocket for something like a bandit whereas of course mine sits over the hub. Now im wondering if its a generic pic but don't wanna take the chance. So .. where do you peeps get your chains n sprockets from ... is it 18/42 and is there a decent upgrade .. Thanks All

 

Thanks all for the responses ... will be hunting one down now