I'm planning on using a more modern 5 or 6 speed like the T56 or similar.
It was US bone yards i was thinking of. Or eBay.
To me it looks like I can choose between rebuildt ones, new ones or from a bone yard.
I have a legal mailbox address at a shipping company in New Jersey. Then I can buy from sellers who don't send outside US, too.

I'm aware of the hydraulic clutch problem, but since I'm using pedals from a car who also have hydraulic clutch, it won't be a problem after all.