Maybe one of these similar products would be of interest:-

4 PACK Trolley Seat Rail Wheel Bowflex Power Pro, XTL, Motivator 1, Ultimate 1

ADAPTOR BOX 410lb upgrade replacement for Bowflex Power Pro, XTL , Motivator 1

BOWFLEX POWER PRO & XTL ROLLING TROLLEY Seat Pad With Brackets Only.

Bowflex Power Pro Only 2x50 lbs Power Rods w 100lb Box Upgrade OEM FREE SHIPPING

2X65LB(130 REAL LBS) POWER RODS for BOWFLEX POWER PRO/MOT1 FIT IN THE 50LB HOLES