I tried every one of the sources Dub listed, and came up empty.
Noticed the seller of an OEM VX roof rack currently on ebay mentioned that his rack was missing a rubber strip, but that they were easily replaced. So I asked him where....he suggested I try "etrailer.com" for replacement rubber strips.
Thule has a couple different ones that are really similar looking.
Check this out! We may have a winner...I'm waiting on some dimensions.