Baldor Electric Motors is no longer manufacturing this motor, possible replacement is the following Baldor Electric Motors part#
EJMM2543T
**** This motor has been replaced by model # EJMM2543T ***
JMM2543T, 50 Hp, 1800 Rpm, 326JM FR, 230/460 Vac, 3 PH, ODP, Foot Mounted, Close-Coupled Pump Motor