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I do not know for sure. But I have two possibilities.
1. They sat down in some holes on the assembly line to move it along. Different plants may have had different jigs to hold the frame. Which could be why some mentioned had 6,4,or none.
2. To keep the frames separated while stacked in the "frame yard".
Let's check out Jeff's theory of being certain factory jig locating pins by having everybody post where their's was built, and if it has pins or not.
Edit: also add if 2wd/4wd/100/250/350 to see if it is just 2wd or split between these variables. My 70 Canadian built CC F-250 4wd doesn't have them.
Edit: I think that my 72 San Jose built F-100 2wd had them.
Is this the game of "show me yours and I'll show you mine?" Okay, mine was built in Kansas City, 2wd long bed and I have six (although I am thinking about cutting them off as I clean up my frame if they aren't used for anything...)
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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