He probably used a kit very similar to that. There are Mustang II crossmembers and suspension pieces all over the place from a plethora of different manufacturers, Heidt's probably being the biggest name that I can think of off hand. You may have a some luck with double and triple checking the measurements and whatnot by either contacting them or looking online to see if they have a PDF with hard numbers on it. Measure measure measure!
Here is Heidt's list of PDF instructions. You'll have to flip through them and find answers to what ever questions you may have.
www.heidts.com
Here is Heidt's list of PDF instructions. You'll have to flip through them and find answers to what ever questions you may have.
Instruction Sheets - HEIDTS
Filter the table below to see each instruction sheet for your part number or vehicle.