1973/79 F100/350:

There are TWENTY TWO different brake pedals, NINETEEN different power brake boosters, SEVENTEEN different master cylinders, SEVEN different clutch pedals, I kid you not!

I cannot help you unless I know what the booster is from.

 

Thank you so much for your help. The mechanic that I found to do the work for me really turned out to be a Gem. I could not locate a pedal for the switch to power brakes and he ended up making a modification of the Booster so that I could use the pedal that I had. He said that Chevy did something like it, an adjustable rod. Needless to say that everything works like a dream. Thank you again for your assistance.