At least tell them you want a Cordoba kit for the caliper mounts, the backing plate and the disc. That way you get a 12" disc setup not a 11". Another way is 2 x calipers and attachment bits = $65, 2 discs 12" = $140, Hoses etc = $100, backing plate and caliper mounts about $50 from wrecker. So $350 odd for srounging and $499 for bolt on kit. I would go for the kit.