Disc brakes for a Comet

[streetrod77]

I have a 77 Mercury Comet that i'm looking for 12" brakes but no seems to make a kit for my car. Baer makes kits for 71-73 Mustang but they claim it want fit my car. Do anyone know why is this? I was told by someone else that my spindle is the same as the 71-73 mustang. Are there any truth to this? Do anyone know of a place that specialize in Ford applications?

I have some options for rear disc brakes but they are 12" disc or more, that is another reason I was looking for atleast 12" in the front.