pull pins

Hey everyone, I have no clue what bumper this is; I have only been able to find one other like it for the 100 series on eBay. I messaged the seller, but I haven't had any luck finding out the information that I need. I have a dual swing out but no pop-pin, locking-pin.. whatever you want to...

IN THEORY this seems like a great idea!! There is someone selling the pull pins and washers on Ebay and I'm curious if it works. Anyone using them...