Buy this...now. If you haven't put your kickstand on the bike yet: Run, do not walk to the nearest phone and order asap-asaurous.
And if you already have a kickstand on the bike - run faster. Tell whoever answers the phone, "Hi, my name is ______. I am a chainstay mangler."
I bought a used Bleriot with a Pletcher 2x-legger on it. When I removed the kickstand -deep gouges through the paint and dents in the chainstay tubes from the metal on metal kickstand mounting and someone cranking too hard at installation I guess.
Buy this, and pay happily the shipping fee if necessary. It will be worth it to save the integrity and finish of your chainstays.
Please don't let this happen to another used Rivbike buyer......It happened to me, but it doesn't have to happen again.