I bought these:

NEVERLAND 8mm CNC Aluminum Motorcycle Rearsets Rear Set Footrest Footpeg Foot Rest Peg Alloy Mountain Bike Bicycle Cycling Black(LWH: 3.94" X 0.98" x 0.98") https://www.amazon.com/dp/B01HNM5AEI/ref=cm_sw_r_apan_glt_fabc_969FQBF3RS8KE72RDN7D?_encoding=UTF8&psc=1

But because the screws that came with were too long (38mm) I ordered 2 x M8 16mm screws + 2 x M10 washers (one on each side), and now it fits perfectly 👌