Posted 9/22/2008 21:23 (#466852 - in reply to #464795) Subject: Re: sliding garage door roller
Go to a reputable bearing house, one carrying Sealmaster, or browning, or McGill, the like...
Ask to see their catalog of cam followers, you might find the right thing that way.
These generally have permanent bearings, and you could even press the pulley you like over the race, piece of cake.