The 501-series is long since discontinued. It was replaced by the 511 in 2009. The 511 is slightly softer but much easier to work on.
1. Yes, but the 511 needs Fredrik Emilsson's diff covers and the hard hex balls.
2. Yes, but if you are a skilled crasher perhaps the 511 could do with the stronger 501 family lower arms and Fredrik's upcoming redesigned shock towers.
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The Tamiya Sheep
Various Tamiyas including TRF201 and TRF511
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