After a few decades in HVAC, if I were you I would worry less about an exact parts match and just take the blower into a fans and motors seller and they will match it all up. Other than the sheet metal body of furnace and AC units-most manufacturers just use common parts off the shelf-usually from low bidder- you know it. By doing this you'll also get the proper pitch and air direction for squirrel cage-best to replace them as they are usually corrosion welded and you end up bending them (even slightly) and you'll have a noisy fan with a new motor.
2002 Monaco Diplomat 36PBD, Avalanche toad, Glastron MX175 , X5 BMW, Almost enough toys, 3 dogs. 1 longtime wife(48 yrs)