The rtr is the same car as the original zx5, just made of weaker plastic and with different driveshafts (only built to run stock motors) so all parts should fit.
The SP is the same chassis as the original, but with much altered and improved suspension geometry.
The FS has the SP suspension, but a "saddle" style chassis with relocated motor, etc. Essentially an entirely different car from the original zx5.
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