RB5 shocks

[Lowie]

I have found (on PetitRC.com) several pictures regarding the different springs that can be used on the ZX (and the RB5).

My problem is that there are different springs and that it has become unclear for me which ones can be used on the RB5, more particular on the front of the car (so short springs).
Actually I have (from soft to hard if I am not mistaken) orange, lime green/yellow-isch, silver.
I am sure there must be other springs but are there other springs that can become usefull and are not in my list of three?

For the rear I have yellow and cobalt blue.