They’re just giving that stuff away.
Better check what MC he is supplying cause the one most kits supply will require a lot of cutting of your strut and frame channel. I believe there are discussions here on this and a long discussion on the 6163Skylark forum you should read.
I used a 1980 Ford Fairmont MC at 7/8″ bore, fits nice but I am not happy with the “long” pedal. Various other options out there, some cheap some not.