Hi itsseanjohn,
PM me for my addy & phone, eh? I'm just up the road from Kindersley in 'toontown.
I'd assumed my '84 was the only year that came with the 17/36 sprockets that are just about right for sidecar work but it seems not.
I'd go 17/32 or 17/33 but as the other posts show, sprocket tooth count has lots of options and to quote Kipling:-
every single one of them is right
I'd stay away from an 18T front because of it's clearance issues and you get the same ratio change by dropping two teeth off the back as you do in adding one to the front anyway.
I'd buy sprockets and a sealed (o-ring or x-ring) chain together as a set.
Old sprockets eat new chain.
Old chain eats new sprockets.
Installed as a set they wear in together like an old married couple.
I'd also buy a Scottoiler.
Others fling a #50 Ag chain onto knackered sprockets and squirt used crankcase oil at it every second oil change.
You choose.