metric to imperial shaft adapters for stepper motor??

I'm replacing a sigma stepper on my bridgeport with a sanyo denki
stepper motor. I made the error of assuming that it would be a bolt-
on due to it being the same NEMA 42 frame size..guess not :)

shaft is a tad too large in diameter (metric I'm guessing right now)
and it's too short, about a good inch.

Does anyone make an off the shelf adapter that will work or can be
modified to work?

thanks,

Mike