Maybe one of these similar products would be of interest:-
570/580LB UPGRADE BOX for "EVERY NON-UPGRADABLE" BOWFLEX POWER ROD USING MACHINE
Bowflex Power Rod Upgrade (210lb-410lb) OEM Fits all Bowflex Weight Machines
Bowflex Power Rod 410 Adapter Models That Are 410 Upgradable Power Pro
Bowflex Power Rod Screws Includes 20 Each To Mount Rods Into Box New Replacement