My mill uses these. I have six, three on each side, riding on the body of the band and one on each side at the back of the band as a restricter,keeping the band from moving back in the cut. They are mounted to some 3/4 solid stock with large bolts, I think 5/8".
http://www.thebigbearingstore.com/servlet/the-1031/608-dsh-2RS-608-dsh-ZZ-Radial-Ball/Detail
