From the pics on Ebay it looks like the sprockets are set up for Tamiya gearboxes with the double flats on the shaft:
https://www.ebay.com.sg/itm/1-16-U-S...6mw:rk:38:pf:0
My Heng Long Abrams has a single flat so if you want to mount the sprockets you will need to add another flat. That might work, but I have no idea what the shaft diameter difference is between a Tamiya gearbox and the HL.