Toecutter
What would DoG do?
Your nearest hardware store should have 'em. I think they're called spring clip hitch pins or something like that.What is a good source for that bolt? Marine store or something to that effect?
I drilled the hole the same size as the clip (1/4"). That way, they don't rattle, as the rubber holds them, but the fit is critical so there's a trade-off.
Make sure to have the bags in a consistent spot before drilling (I went with all the way downward and centered in the upper slots), so it's easy to locate the holes when they go back on.