Shark Vacuum Cleaner Parts Cross Reference?

Does anyone know how to cross reference a motor for a Shark Vacuum?

I have an older model NV340 Shark Rotator. Motor burned a bearing, and in changing the bearing I stripped the threads on the impeller shaft!

So I need a new motor. There are hundreds of motors for sale on places like FleaBay, but none cross-reference to an NV340. Many motors look similar, but have enough differences (brush arm distance, rubber grommet, etc ) that I'm not sure they'll work.

Does anyone have any suggestions?

Thank you!

-Michael