I honestly can't remember which springs came with the RB5SP2-WC but I think they weren't Xgear but 'similar to' pink at both ends of the car.
The ZX5 FS2-sp again didn't come with Xgear springs but the springs it did come with were, I believe, similar to Yellow front and Red rear.
Typically I run orange/gold as a starting point for both cars and often use Yellow fronts and red rears too.
As for pistons the Kyosho pistons are brilliant quality machined pistons.
If you want to try with a cheaper piston then the Associated piston kit can be made to work by putting a 0.3-0.4mm shim UNDER each piston. The fit is ok but they are square edged rather than radiused and no where near as accurate as the Kyosho pistons though.
Hope that helps.
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