I charge $120 usd for the bracket package. Comes with all the fasteners, instructions and brackets. Only thing you need to supply is the calipers and rotors from a 2000 base model ford mustang and I also used the rear emergency brake lines from the same mustang and moved the e brake bracket under my 67 dart to fit all the lines perfectly.
Have you considered building these brackets for the 11.65” cobra rotors? The base model and cobra use the same calipers, the cobras just use 11.65” rotors instead of the 10.5” rotors.
