I believe the part number you are looking for is VLBSE-07512-BC which is a very old motor from the Velconic E-series line.
Toei/Velconic is now under the Toshiba Machine umbrella. The new X-series of motors and drives are compatible to the E-series. The motor, drive and cables would have to be replaced.
A equivalent motor, with same bolt pattern and shaft size, would be the VLBSV-10015V-B and the drive would be the VLASX-035P3-HXM-0001.
Hope this helps. Manuals are available at www.iis-servo.com