I discovered another source, one which may be a lot more available for some people. Especially if you know anyone in the auto collision repair industry. Which is a fancy title for auto body shop.
These are for late model Chevy Light Trucks, and SUV's that have the plastic fender flares. These pins are just the right size for our RC51's bottom fairing connectors. And as you can see, they are easy to remove because of the slot for a screwdriver.
Get them at your buddy's body shop, any Chev dealer, or online. Sorry I don't know how much they cost, my friend gave these to me. I think they're really cheap. I've also seen them at automotive paint suppliers, and I've seen a good selection at Ace Hardware too. In their automotive fasteners section.