I also found drummers' gel pads/dots work as well, or ( Atacama/silicone) gel pads

Checked the local store, big selection of the non-sticky in 12x18", 2mm or 5mm. Just a few of the sticky, had to search for them. Cut a 3/8" strip off the sticky and bent it in a circle to see how it'd do as speaker frame gasket, not as pliable as weather stripping, but looks nicer and cuts clean. The 5mm non-sticky looked handy, think I'll try it as a partial insole for my work boots first, but that's for a different sort of review channel. Curious what it does as a dampener.

Wood grain SSCS5's??