Hi grumpy, the electric motor on my Supercut (Model 17) would not be suitable to fit onto a Model 45. Completely different drive layout and uses a counter-shaft and dual pulleys. I am not familiar with the drive set-up on the electric Scotty 45's.
However, I believe Tony should contact Keith on (03) 5339 9385 or his mobile 0438 357 100. He has a lot of second hand Model 45 parts and very handy with his knowledge of all things Scott Bonnar.