Update on getting the part and replacing it ...
I was able to source the correct sensor bearing with connector for $98.99 with shipping included, payable via PayPal from here:
https://www.nocoev.com/product/NSK_6206V.htm
NSK Sensor Bearing 6206V
Connector Option: AMP 4-Pin Connector
I had to pull all the batteries, disconnect the rear brake cables, disconnect the transmission control cables, seat and side fairings to get to the motor. I had to remove the electric motor from the transmission and remove from the cart. Once on the bench, I removed the armature and then used a puller to get the old bearing off. Reversed everything to put back together. All the battery J hooks were rotted, so fabricated replacements out of threaded rod, which cost ~$20.
It now works again at full speed, so I'm very happy with the result.
Thanks,
Mike.