it will work yes - but it's certainly not ideal and will be noisy. I think the first few runs it will take some material off the spur also.
You might be able to get a 48dp spur for the original car, but I found an easy way was to get the tamiya slipper kit - and an associated B4 spur / slipper pads. I think the B4 81 tooth spur is a larger diameter than the 82tooth kit spur - so that gives you an idea of the different sizes. 81t 48dp spur also needs the gear cover sanding inside to fit the slightly-too-large diameter.
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