BWC.Com roller covers

When I installed my Y car shopbot had included nice little covers with a oiled wick that keeps the ways clean and lubed. I noticed the X rollers also have little tapped holes for the same style of covers but none were in the crate with the Bot...

Is the a part # that would bolt up to these holes?

This is off the Dual-vee site......

Pretty sure they only come on the Y axis from the factory.

For those thinking 'Hey - I got cheated' - they only came/come on tools with W3 size rollers on the YZ car. X axis still uses W2 as far as I know.

-B