Replace Schwintek slide roller?

I have a Schwintek system on my bedroom slide out. One roller would continually grab the rubber seal. Looked just like yours. I lifted the slide with a board and reached in and cut that section of rubber off. The end caps, as Doug said, are pressed on. They can be difficult to remove but a screwdriver and hammer should drive one off to allow removal. Is there something wrong with the roller or is it because it grabs the rubber?

I can't envision the new type you are referring to.