type 3 to type 1 rear brakes

.....What you need from a donor type 3 car is the splined hubs that fit on to the stub axles and the back plates. You don't need to change or modify the axles. The outer face of the hubs where the axle nut seats have to be machined down on swing axle bugs. I don't remember how much. My '77 bug was a bolt on fit with no machining.

.........If you have oversized rear tires like me (205/65) and smaller tires up front (185/65), this a great way to rebalance the brakes so that the rear brakes are doing more work. My '77 stops much better with them.