Many thanks, that makes life easier.
Also, another thing to keep in mind
Early Triumph 350 (and maybe 500) bushing cranks are different from later bushing cranks
I had a crank from a 1958 Triumph T21 and the crank was shorter in length when compared to a later bushing crank
The cheeks on the early crank is similar to an A50 / A65 design
I used a T21 crank in a set of 1963 cases and I had to shim the crank to prevent end float and to center the roads since the crank is shorter...
You can use an early bushing crank in any bushing motor crank case, however you cannot use a later bushing crank (which is longer) in a set of early cases
The chances of you having a early crank is slim, I would assume the "early" crank was used only for a few years (1957-1958 or so?)
Sorry about that!