Gee whiz there is a lot of straining at the gnat and swallowing the camel here. Firstly each pinion has a diameter that increases with the teeth on a given pinion which means they are a pitched pinion and do not have teeth cut to fit a fixed 6.5 mm diameter. This will make any of them unsuitable excepting the 6.5 mm pinion for 1/32 plastic cars. Pioneer have a weird diameter pinion so picking the right size for their gears would need you to measure the original with verniers,
Plafit and JP do plastic pinions in 50 pitch already that are cheap. Are these 48 pitch? I couldn't see any designation.
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