Afaik the plastic shocks have different diameters front and rear? so 501X pistons won't work.
Saying that - the 'hop up' shocks that Tamiya make for the DT02 / DF03 etc have the same diameter pistons as the 501X but the 501X pistons are about 50% thicker so won't work....
In other words there are probably multiple ways that the 501X pistons won't fit ! And pistons are the main problem with these plastic shocks - the provided ones are simply crap.
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