I pulled a 9 inch rear end from a hot rodded Pinto (ha) recently. I know the 9 didn't come out on a Pinto, but I am trying to figure out what it came from. It has the familiar C7 casting pumpkin. The measurement from flange to flange is 54.5". The measurement from spring perch to spring perch (centers) is 42.25". Any ideas???????