I have six Thule feet that came on my SMB when I purchased it. These are designed to sit in the Thule tracks. I replaced the crappy black oxide fasteners w stainless steel.
While I have six feet, I only have FIVE covers. The other one is in the woods somewhere . . . .
Would prefer local pick up, but these should be shippable if buyer wants to pay for shipping.
Some pictures in my album if these installed on my van.