Motor Upgrade

Hello,

I currently have Sta-Rite Max-E-Glas II (P4E6G-189L) pump, that was recently rebuilt (new impellor, diffuser and seals) with a K48N2PA105 motor installed. I would like to upgrade the motor to a variable speed. What are my options?

Includes a Caretaker 99 in-floor cleaning system (15 heads). The pool/spa controls are remotely located.

I appreciate any help,

Kevin