@1buckie, it looks like you have a vintage roti ring based on the squared support tabs and the hole opposite of the motor bracket. The modern roti rings have a notch cut out opposite the motor bracket which makes it easier to insert the spit. (Look at the pics Walchit posted of his modern ring for comparison).
The spit you’re looking for is shorter and will not have a handle (to fit through the hole opposite the bracket). The motor you’re looking for has a protruding “sleeve” into which the spit is inserted, and fits into the bracket using two screws. Unfortunately a modern motor/spit will not work for your ring.
Sweet brownie, BTW.