Here is the latest. I have both a nos national okie bushing from around the 40s or 50s and the 1936 gm forward and rear bushings that came in a set on eBay. The gm bushings fit perfectly. The okie bushing od would need to be machined to fit the tube. I'm going with the nos gm bushings. I found that a 26x37x7 mm seal works perfectly. The only thing I'm working on now is drilling a hole in the rear nos bushing to lock the bushing in place. It's a slip fit, not an interference fit, and needs the pin to prevent rotation.
