"i reject your reality and substitute my own" - adam savage. i suspect my final words maybe "well shit, that didnt work"
instead of perfection some times we just have to accept practicality
try florin tractor, or a wrecker like tillys crawler parts at toowoomba the freight might kill you though. also a wanted add on the forum never know who has what. besides shafts are pretty easy to make if you have one to copy or original drawings others have been able to get part blueprints for NLA parts via the dealer and have them made to spec.
Is it the 3P3661 bell crank you are looking for? If so there are several listed on the www.machinerytrader parts listing.
Where are you located?