Well, the Cat rollers are over $600 CDN & I did get a couple of Berco to act as spares while rebuilding the cat ones & wouldn't you know it, they are not a fit, not even close. We can buy a seal set for the Cat from Cat for around $120/set, so at this point we will keep on with the rebuilds, one at a time as time permits. I must admit, it is hard work though!!