As far as I know, sprockets meant for Tamiya gearboxes cannot be used with HL/Taigen drive shafts. They can be made to fit with major modifications but you're better off going with the metal tracks for the HL Leopard 2. I read on another thread that the Leo 2 tracks are the same as the M1 on the HL model. Better yet, Mato will surely release a metal track + sprocket upgrade for the M1, just have to be a little patient .