I have 5 Ameristep straps with the flathooks sewn on. I don't know how guys are using them with the OCB, but if you want them you can have them. The black strap doesn't have the hook sewn on anymore, but I have the hook. You can see how the Ameristeps were removed on the 1 brown strap.
Just pay shipping and they're yours. I'm guessing around $5? Two are spoken for with BOMO and Erniepower.