Lift spindle & Coilovers

Hey all,
I currently have a Readylift 4/2 SST kit on my Tundra. I have been looking at Fabtech's 4" spindle and coilover lift. I'm trying to figure out if I can use there spindle and coilover's to replace the lift spacer that came in my Readylift kit and retain the 4" lift. Fabtech part #FTS26069 steering knuckle and front dirt logic 2.5 coilovers with reservoirs part #FTS26052

I contacted Fabtech via email, and was told to remove the Readylift and just use there entire kit. I would look into doing that, but the Readylift and Fabtech have the same components other than the spindles and coilovers.

I guess I could just leave it as is, but I can never leave things alone.