BE-65 to BE 194 or 2230006 No tach reader
BE-66 us tach reader version to BE-172 or 195 and other.
Your motor is a 8mm by 22.5-24mm length worm. 30mm dia Flywheel. Newer motors usually have 27mm.
I have 2 new MTH motors that will fit, both are set up for Tach Readers and have the 5mm by 27mm Flywheel. Correct worm gear. You can e-mail me if you need them. I do believe many of the early motors are out of stock. I used to keep the original part number motors in stock, but MTH ran out. G