I believe the rubber rings on the anti-skate device are 8mm outside diameter and 3mm inside diameter. The finish on the VPI parts, such as the VTA base, is "glass-blasted aluminum."
Wilson--I received the 8mm X 3mm X 2.5mm o-rings from a seller on Ebay, and they look to be the identical size to the ones that came with the VPI anti-skate device and fit like the originals. I can't confirm the rubber material is the same but it is at worst, very close.
Thanks stoebben! I was about to contact you. My o-rings still work but a couple have developed tiny cracks so wanted some backup ones. Appreciate the follow-up!
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I’m trying to find the same. I believe they are 8mm OD X 3mm ID X 2.5mm diameter