source for a replacement motor wanted

[19hokie81]

Greetings!  I've recently acquired an older (what I thought was) F7, but it was inoperable and appears to have been shorted out.  Researching the parts diagram however, the motor I'm working with shows up on the F9 parts diagram.  This diagram indentifies the motor as part number 9902.  It is not stocked by Bachmann.  After searching the Bachmann site thoroughly with no luck, I've written them and they confirmed the part is no longer stocked.  They suggested I try here for any suggestions as to sourcing this motor. So, what might you suggest for me?  Thanks in advance!