Unless you're in good with a machine shop, you might as well buy one. You can get a set with the alternator and waterpump pulleys, for less than $100.
Only differences are that some of the older Windsors have balancers which take three-bolt pulleys. Sometime in the '70s they changed to a four-bolt setup. If you have a three-bolter, your choices are more limited.
__________________ 1992 Deep Emerald Green Mustang GT Hatch, 5 speed, 2.73s, Mac fenderwell cold air intake, '93 Cobra MAF, Mac 70mm throttle body & spacer, Explorer intakes, Mac unequal headers & offroad pipe, Magnaflow catback, Walbro 110lph fuel pump, Jet adjustable FPR, MSD Blaster coil, Accel 8mm wires, FRPP aluminum quadrant, UPR firewall adjuster, stock cable, Granatelli upper control arms.
Waiting to go on: Granatelli lower control arms, and GT40 Iron heads! | 
crank pully swap? 
