Baldor Electric Motors is no longer manufacturing this motor, possible replacement is the following Baldor Electric Motors part#
EM2531T
** This motor has been replaced by model # EM2531T **
(M2531) 25 Hp, 230/460 Vac, 3 Phase Input, 326U Frame, 1800 Rpm, Open Drip Proof, Foot Mounted, General Purpose Motor