It looks like I definitely have a later gearbox. The speedo drive was a clue but not the full story. I used draganfly's site/drawings and ordered 66-3058 and the gasket from same drawing. Gasket was correct but spring slightly too big all round; 2 1/2 " rather than my 2 1/4" and thicker guage wire in its construction. I tried fitting it anyway but no good as overall depth pushed starter shaft off it's natural seat.
A couple of pics to draganfly and they identified my box as a 1950-62 possibly from A,B or C models? This might explain an earlier anomaly of it have 3/8" final drive chain and sprocketry instead of 1/4" ??
Ian yes the rubber bush was well shot and I got one them OK.
I reckon I might still need to get clutch off as I think even once starter working the clutch was slipping preventing decent action through to crank.
Do I need some special tool to get clutch off; spring presser of some type?
