It just takes a few minutes to make your own "short shaft" pump. Remove the back plate, set the pump up in a hydraulic press, and push the fan/pulley flange back whatever distance will make the pulley line up with your old pump spacing. Then use an angle grinder and a cutoff wheel to trim the end of the shaft to length. If you're not comfortable with doing that, send me a new long shaft pump and your old one to use as a pattern, and I'll be glad to modify the new pump. PM if you like, for more details.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!