To replace 48 frame motors that may have customized mounting brackets, G.E. has produced the PDQ motor series. These motors have a 1-1/2" extended spline hub on opposite shaft end for quick and easy positioning of resilient ring to properly fit existing motor brackets 5KH39DNA533T AC Motors Air Moving Motors Furnace Blower, Belt Drive Single Phase Split Phase - Open - PDQ Mounting 1/4HP FEATURES: Sleeve or ball bearings Reversible rotation 48Y frames have mounting holes for both 48 and 56 frame