Larry,
I just made one a few weeks ago. I have my front trunk tore apart and have the pedal box out at this very moment. I have a replacement that came with the vendor supplied aluminum reduction kit but it was shorter than the stock one I took out of my car and did not have the hole bored through for the roll pin. I made one from precision ground 4140 stock sourced from McMaster Carr. The stock was more than what Wilkinson is selling them for. What we don’t know is the material they are made from. 4140 is vary hard and should last as long as I own the car.
There is just enough corrosion on the old shaft in the mounting area to make it a tight fit. I can only assume dissimilar metal that’s been in contact for 50 years. The outside of the shaft measures exactly the same as the new stock. The new shaft is a loose fit in the aluminum boss. I used Loctite 660 when I assembled it and a new 2mm x 22mm roll pin. It’s solid as a rock now. Be aware that the roll pin is offset to one end by about 0.030”.
https://www.mcmaster.com/product/2672N42
