OK, I bought 3 PK296 motors from Bob Dodd. He gave me a screaming deal on them. The gears that he sent with them are larger diameter than the gears on the PRT machine and the motors mount differently. Bolt spacing is different and obviously with the gear reduction, the spindle is not centered like the original motor. And with the different spacing on the new motors they are also threaded. So both the mounting plate and the motor mounting areas are both threaded.
I know I must be missing something. I haven't even thought about the 4 wire to six wire issue yet.....Bob also sent me the tool to remove the wires from the plastic plug