I did some research (looked it up in the 75 MPC) and believe the part number is C2OZ-2035-D. This is based on that p/n as being shown in the illustrated section with base number of 2035 for that application and being the only front brake spring with a quantity of 2 in the parts section.
It seems that all the Ford brake springs have a base number of 2035, another great idea from Ford.
Having a Ford part number, even if it may be obsolete, would make it easier to find one.
Jim