I waited for the parts to be in badge exchange because I’m broke rn and couldn’t get the pack. I put them on a build and looked at the weld points to see how I could attach a weapon to them and saw this:
Note: I did not rotate them, and this is the under side of the part.
They should be mirrored, why are they missing a weald point?? This is going to drive me nuts!! 
You’re broke because you spent all your coins on THREE HUNDRED bowling pins for your garage! 
It was more than that!! 
And I still need more
please tell me what pack they were from, thank you.
If I remember, they were from one of the “Iron Beast” packs (there were several editions)…the one out there in the store now, doesn’t have them, so it must’ve been from Iron Beast Deluxe pack, which apparently was a limited edition.