Your question is a bit confusing and can best be answered by what was installed. For 1964 thru Mustangs, all V-8 (260 and 289) steering stops were the same for both power and standard steering applications. Ford Car Parts shows C5ZZ-3A706-D and C5ZZ-3A707-D as service replacements which by the "-D" implication "may" indicate the fourth rendition. The even number is RH, the odd LH. For 1964 thru Mustang, all I-6 (170 and 200) steering stops were different for power and standard steering applications. Ford Car Parts shows C5DZ-3A706-A and C5DZ-3A707-A for power steering and C5DZ-3A706-B and C5DZ-3A707-B for standard steering. Note that these are Falcon designs.
Jim