The main issue with the 68-73 Mustang Disc brakes (68-73 are essentials all the same), being installed on the 65 66 is the steering arm length/Geometry.
As is the Granada brakes, the Bump Steer issue will be present. All the Ball joints mate up, bolt on and function perfect. This pertains to ALL 65 66, V8- 6 cylinders, etc. Bolt on any of these 68-73 Spindles.
The Geometry problems (As with the Granada Brakes) can very simply be overcome by a DAM OLD Alignment Guy, that knows how to Hot Rod a car----No Kids allowed.
The tie Rods on all manual steering cars will be the 70 Versions 387's, (on the 68 69 the 360's)).
(If installing Power Steering, Passengers side will work fime, on the Drivers side, you will need that Dasn Granada Special made outer. Yes you need to "RIG it up" to fit---As in the Granada brakes, but it will work.
So, yes these work fine, just needs a bit of old Hot Rodding techniques, a Meeting with BUD, and enjoy.
Dan
chockostangclassicmustang.com