I found this company while searching the Internet for retrofit kits for Magnum Phoenix GS router:

Low Cost CNC Retrofits, Lowest Possible Price in Industrial Stepper, Servo Controller Packages. Shipping WORLDWIDE

I e-mailed them and they asked me about the stepper motors. The stepper motors have labels that say: 5A/10A 1.8 DEG LA3ABJK-P500. The machine was made in 1990s. The stepper motors in the machine are similar to the stepper motors in the 2.5A kit. Any suggestions?