I don’t know what your forks are off but they are not from a 750 twin. The twins didn’t have any air balancing pipes. I would guess maybe a 4 cylinder LTD.
If you don’t want to refurb your starter motor there is a company advertising refurbed starters on ebay.
Also I am not sure if you can get a round master cylinder for twin disc.
We have various gaskets but I doubt full sets. Will see what I can get together there.
Cheers for now