Mod Squad Soft Shoes? Anyone have them?

Hi, a long time ago audiophile Audiogon member Albert Porter was kind enough to send me 3 Mod Squad Soft Shoes. They're something like a small stubby hockey puck used for sound isolation under components. They really worked but unfortunately, one of my set of three got lost somehow. I think a cleaning person threw it out, not knowing what it was, yikes! I'd truly be grateful if someone could help me find one, three or four of these.
Thanks,
Martin Butler