The problem would be the original manufacturers all had different designs. The one I have is a B&M. I have not seen them all, but from what I’ve read, the B&M were the most popular, but had the worst design when it came to keeping trans sauce out of the bell. If you have a need for a specific shaft, it was stated earlier in this thread that liberty or g-force trans will make you anything you want. I believe it. I just put a 100% billet 6 speed sequential gear box in a car for a guy. Every part of the trans was made to order. They will make you anything you can dream up. And as you know, the more you make, the better the cost per shaft would be. I believe Winters still has drawings of the parts on their site. I called for parts, but they said they only had a few things left for the 727. You can still buy a new complete conversion for a TH400 from them though.