Whoopee!!
Here y'are -
https://jack-first-gun-parts.myshopi...ruger-old-army
Available components include s/s and blued cylinder base pins, rammer levers, bullet rams and certain internal components. Some screws are also common to the centre-fire Blackhawk and Super Blackhawk, like rear frame screws.
However, be warned that this vendor MIGHT not ship outside the USA, especially for such manifestly dangerous items as a trigger hand...the word here, of course, is 'trigger', and that probably 'triggers' a connection to weapons of mass destruction and ITAR.
So, in the end,I guess it's down to doing the deal if and when you are stateside.