The 501 body will fit but it does not leave much room for brushless motors. Get the WE edition if you can as this has an extra bulge for the sensor wire.
The tamiya pinions meant for the car are all long allowing full contact with the spur. Partial contact is asking for trouble. The tamiya part numbers you need are:
54062 (13T, 14T & 15T)
53964 (16T & 17T)
53965 (18T & 19T)
53966 (20T & 21T)
With regards to space the is more than enough for any pinion that would be realistically used in the 501 so the 511 will be the same.
James
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