It SHOULD work. Met a guy with a 69 Mach who had installed the 91 pedal hanger and was using the 91 clutch pedal and cable setup much as it was used in the foxbody. Said it was almost a direct bolt in, had to drill a hole or 2. Past that I dunno, didn't get a good look at it and getting info from him was like getting water from a rock.

I do know it wont work in 65-66 unless you like to butcher the firewall. I know they changed the firewall in the later cars and it's supposed to be shaped ideally for the fox pedal setp?
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66 coupe 5.0/T5, home-brewed power 4 wheel disc setup, 350hp+, looks like it belongs in 1968