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I am looking to buy a roller tuning kit but see they come in various sizes like 16x13 ect my engine code is a 161QML does anyone know the proper roller sizes I know I will have to play around with the weight I just want to get the correct size.

I have a older Yerf Dog Spider Box the engine has been removed this weekend and I want to swap for a Predator. I measured the axle and it around 37" . Has anyone put a predator on that would give some tips. Axle sprocket is mounted right side but I would need to to on left to accommodate the...