I (like so many others) am contemplating swapping in rear discs on my 14 bolt FF. I see TSM has a kit for using 3/4 ton disks and calipers(?). I've got 1/2Ton calipers kickin' around and I know what 1 ton calipers look like; what the difference with the 3/4 ton calipers - are the same as the 1/2 tons but with bigger rotors? Or are they a totally different animal? Is anybody using something else for calipers/rotors on their 14bolt?