1980 900SS Engine Sprocket

[chbevelbob]

Hi
I am replacing my sprockets and chain and I have had memory failure - is there a metal spacer between the engine sprocket and the crankcase ?
I have a candidate but cant remember if this is correct - 50mm diameter with a bevel on the inside
Thanks for your help
cheers
Bob

[Lumpy]

Yeah there is a spacer at the back of the sprocket. It measures 40x45x14. For some reason in the dusty archives of my memory I recall an O ring also but can’t see it listed on a parts list.