The springs have Ford part numbers and they are in fact at least Ford springs. The pic I posted in my first post is from Posies website....I have used the posies springs on several other restoration projects myself and they are a great product. However I will not pay $400 dollars to replace the springs when all I need are these little spacers. This truck also had coil helper springs mounted to the rearend housing from the factory, so this may be a trailering style spring. I checked the original ordering paperwork and aside from the "convenience group", rear bumper, 25 gal aux tank, and overdrive there are no other special order options listed.
It is a 1970 Sport Custom F-100, my grandad was the original owner and these are the springs that were on this truck new. I have every single receipt from everything that was ever done to this truck and there is no mention of ever replacing the rear springs, I can tell you that he bought new spark plugs in 1981.....
Here is the part number from the spring if this helps.
Thanks in advance for any help,
Todd