Electric Motor Assembly is an assembly that will replace the field, coil and rotor assembly of the "B" type rotor. To mount the Electric Motor Assembly simply use the existing mounting layout. The Electric Motor is a slightly noisy, high torque version that rotates clockwise and is non reversible. Measurements: 63.55 (2-1/2") (H) x 57.2mm (2-1/4") (W) x 57.2mm (2-1/4") D including shaft).