I'll give a "thumbs up" to Mustangs Unlimited on things like this. I did a C4 to T5 swap. When ordering the cable clutch, I asked the rep, "E-mail a list of everything I'll need". Holy schiznit... pedal bushings, pads, pad trim, clips, washers, nuts, you name it... stuff I never would have thought of and would have had to wait days if, in the middle of assembly thought, "oh, I need one of those".
I'm sure many other suppliers could provide the same for your project. Put the question out to a few suppliers, compile the list, and buy everything

Ain't classic Mustangs a fun hobby?!