Century part # 0-177215-04, p56y frame, 230 volts, 7.1 amp

If you google your part number you can get a one speed for about $190.00
AO Smith Centurion 1 HP Threaded Shaft Motor Part #B853
http://www.positivepoolwholesale.com...ool-motor-b853

From a quick search I found a two speed for a little under $300 I would not trust my interchange abilities and if you chose to use someone I'd call or email them the info and let them confirm or direct you to the correct bolt on motor. I've replaced motors and it's no big deal in most cases.
Specifications: HP = 1, RPM = 3600/1800, Voltage = 230, Amps = 7.2/3.0, Service Factor = 1.65, Frame = 56Y, Shaft = Threaded.
http://www.inyopools.com/Products/00200017039442.htm

If the bearings in your motor went out and the pump was OK before the motor failed I'd just go with a motor. I'd go with a two speed myself.

I'm not recommending anyone these were just quick look ups I came across.