Maybe one of these similar products would be of interest:-
Kipika Y-Shaped Dip Bar for 2" x 2" Power Cage with 1" Hole - Dip Bar Attachments for Home Gym - Heavy Duty Power Rack Attachments - Squat Rack Accessories for Strength Training
Kipika J-Hooks and Weight Plate Holder Set for 2" x 2" Power Rack with 5/8" or 1" Hole - Squat Rack Attachments for Strength Training and Weight Storage - Fits Olympic 2-inch weight plates.
EZYPAK Belt Squat Bar Machine Attachment for 2 inch Olympic Barbell Bar, Black, 500 lbs Withstands, Attachments for Home Gym Workout
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RitFit AT02 Hack Squat Attachment Fit Racks, Power Rack Attachments for Home Gym, 352lbs Weight Capacity Space-Saving Squat Rack Attachments