Passenger footpeg replacement Rebel 300/500
These might work for the Right side – the Right side passenger peg bolts on and is 10mm.
The Left side attaches with a pin with a bracket – I do not know if this Amazon set will work for the Left side. This set is lower quality than the OEM pegs but they are “OK” for a cheap footpeg – I have used them before.
Universal Motorcycle Round Folding Rear Passenger Foot Peg Set – 10mm Stud Pegs Rest Footpegs https://a.co/d/9VDAYUM