George, I bought the last one from both Chicago Auto Parts and Friesens Chevrolet. Thanks again for the lead.
Two tips I learned from the internet that I thought were worth posting about installing these dust caps. First, put the dust caps into the freezer for an hour or so before installing. This temporarily shrinks them a tiny amount and makes them easier to install. Second, tap them into place with a 2" PVC pipe end cap fitting. The PVC fitting fits over the dust cap and catches the lip. By tapping on the PVC fitting instead of directly on the dust cap, you avoid denting the dust caps.
Maybellene
