I believe that the Colombo's used Pabst brand fans - unfortunately not something that Grainger stocks, so you might wanna keep a spare around in case it goes bad in the middle of a big job.

Voltages vary by brand & input voltage @ the mains. I believe that all HSD spindles are 24vdc (not certain about toolchanger models), Colombos are typically 230v AC, unless 460v mains - then it is 24vdc. Double check your spindle fan before ordering to be sure.

-B