If you show us how they fit on the truck, maybe we can figure it out. They look like they might be bumpers for when the suspension bottoms out.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.