I don't track my car so if I was going to do it over on my vert I would add the Global West and leave the factory units in place. Naturally you cannot use the GW seat supports but big deal I'd rather have the extra suspension support. Later you can add the GW jacking rails if that is the direction you want to go with your car. Just another option for you to think about.
absolutely horrible idea. the stockers are not worth shit. they are so flimsy they add very little to the equation. and the GW jacking rails will not wor with the stockers IIRC.