Well it finally dawned on me where I saw them. After searching through the Facebook Van Classified groups and coming up short, I remembered it was when I was out and about in the junkyards a few weeks ago. Are you looking for the chrome kind with the rubber insert, or the style that are entirely rubber/plastic?
This one I saw was the one I was specifically thinking about. Though I don't see the missing guard laying around in the picture, I can check the inside of the van as I have to go back here to pull parts from this van anyway.
This van is in the "Meth Heaven" Yard. Yeah, it's literally run by meth-heads and they charge ridiculous prices sometimes to help fuel their habits. Their yard helpers reek of cheap liquor, crank, and other misc. bad decisions. They want upper eBay prices on most of their stuff, and I doubt these are what you were wanting, but I don't mind asking them for a price and grabbing them if that is what you're looking for.