Status update: So I walked into the local Napa Auto Parts store with my used green gasket and ... the service guy took one look at, sniffed it, then said he knew what it was but its not green anymore, its tan. Came back with a roll of "Felpro Karropak 1/32" (12" x 36") Sheet Gasket Making Material". Love Napa! My dad introduced me to them back in the early 70s (he was a mechanic) ... used them for parts when I rebuilt my auto engine in high school auto shop. They always can deal with the hard stuff that you don't see on the shelves ... just have to ask them 