WPNS421

I have a feeling that the items are bolted to a box/vehicle and used to tied down heavy eqpt. f you look at the items closely you see 4 bolt holes and the clevis but there are 2 different types thingys. Look at the clevis and they attched to the piece in different direction, bolted on the side or rear all clevis in the same direction??? Used on something like a bridging 5 ton???
I am going to buy my new M816 next week and will look at the wreckers in the yard to see if the items are there.