Battle Version toe arms

[NFSP 350]

I was going to buy the Battle version rear toe and camber arms. Only problem is they say that they can only be used with true coilovers. Anyone know why? I am running Bilstien pss10 coilovers ( rear spring mounts in factory cups), Hotchkis F/R swaybars, powergrid endlinks, Evo 350 front A-arms, Factory rear control arms. I had a Kinetix Rear traction package but didnt like them at all, so I sent them back. Any ideas or suggestions?

[MisteenoMike]

If I'm not mistaken, it's because the Battle Version arm omits the "cup" for holding the spring. Hence you need a coliover that has the spring on the shock itself.