My large drive pulley above the motor was lost in a move and I need to get a new on on there, could someone tell me the diameter of it, the big pulley not the one on the motor.

Also I need to install some woodruff keys one in a 9/16” shaft and another one in a 7/8” shaft. I’m thinking a 3/16” key for both. What cutter would I need and could I use the same currier on both shafts?