I don't think the joints for the torque tube are available through the general after market. Restoration vendors have repops, but I think they are all made in China. I find NOS joints on eBay occasionally. I think I would prefer a good used over a Chinese repop. Is your joint broken? If not, it may still be good. I remember years ago a lot of good joints were replaced and the problem turned out to be the bushing in the torque tube.