from 2005 post by 'cobrajeff'
Let me try to clarify a few things in this discussion. I have checked the 1965-72 Ford Parts Master Catalog again, and the color code daubs are RED for C5ZZ-5310-F and BROWN for C5ZZ-5310-E. So I believe there is a typo in Mad4HiPos's note regarding the colors.
With respect to kar-nut's info from the released Engineering drawing - the part he has described has an Engineering part number of C4ZA-5310-E, and a Service part number of C5ZZ-5310-F. Note that the prefix and the suffix of the Engineering number and the Service number do not always match.
With regard to Charle's note about the springs with white stripes, here is a quote from a footnote under the Mustang front coil spring chart on page #100 of my 1965 Ford Parts and Accessories Catalog:
"The load pounds figure shown indicates the Mean load. Usually there is a variance of 30 to 50 lbs. plus or minus of the load pounds indicated in the chart. If the tested load rate is on the mean to low limits, a white stripe is shown in addition to the other identification markings."
It appears they tested the springs, and the weaker ones got white stripes in addition to their standard markings. So, it is quite possible you would see springs with white stripes, and, obviously, they would be used in pairs.
Hope this helps to clear some things up.
regards,
Jeff Burgy
cobrajeff