I've seen a few members that have them on their Fit, but I can't tell if the rotors were the stock ones or an aftermaket. Spoon offers twin-block and a monoblock versions, not sure which would work on the Fit (monoblock is said to be universal?). I know they aren't cheap, but if they can be swapped easily in place of the stock calipers, I'm going to start saving money to get them, as well as some steel brake lines

 

you will need the twin block, adn it wont fit on stock rotors, you'll need spoon ITR rotors

with money you can make anything fit, with the right modification you can fit the mono block on the fit