I was told there are FOUR different pedal arrangements used in Pinto and I believe that is not including the Automatics! I'm sure the change from 71-73 to the Mustang II based cars is one of the changes. I think that booster/Non-booster was another and the fourth??? I never knew this until I attempted to put 79 ESS pedals in my 73 and they didn't fit. Thankfully the late Fred Morgan was willing to do a swap with me and we met up at Knott's. So, just make sure you have you are getting the proper year/type pedals. Also make sure you get the connection pins/clips, plastic bushings etc.. Most of the plastic bushings are worn but something is better then nothing.