Label on motor stated F0510B2944 which is the exact model I replaced. Purchased with the accompanying thermostats to replace a seized motor and old thermostat (both from 2006). Removal of old motor and blade was simple after loosening 2/3 3/8" angled bracket bolts and twisting the brackets. Twisted off the old conduit and kept the two electrical connectors and ground screw. Old blade was easy to remove with Allen wrench and gloves. Measured notch created on old motor shaft to align old blade on new motor shaft. Tightened Allen screw (light torque) and reinserted assembled motor and blade into place. Aligned the three threaded bolts and tightened nylon nuts (again, light torque). Fan self-aligned with tightened nuts and spun freely. Connected wires as shown in diagram and it worked perfectly!  Will buy another as a spare. Looking forward to a cooler second story.