Mike, thanks for the info and the original source of the perforated board. Some Chrysler product trucks and vans used the same material. Stude's, too, I think. Some Chrysler products, like the '60 Town and Country on which my Briarean is based used the same panels, running side-to-side, held in place by the plastic strips. I've looked high and low for a source. Some people glue similar-patterned white vinyl over hardboard. I was about to do that. Or drill a gazillion little holes. Then I learned that Kramer Auto (kramerauto.com), supplier of unique, quality MoPar restoration parts, sells it for a few 62-65 applications, listed in their catalog. I have to get back to them about asking if their supplier can make custom-sizes for me. (They emailed me that they were heading to a show when I asked, and I have yet to get back to them.) But if there's a direct source that would be good news.