I believe that replacement 1.5” roller wheels is Prime-line part D-1797. Thanks for this video.

For those who live alone, or don't have a buddy around that can help lift out heavy doors (especially the newer heavy and thick ones in S. Fla that are 8 feet high, wider and weigh 300-400 lbs), you can just leave them in place and pound out the side rails. Then slide out the rollers and replace them, as demonstrated here: kzfaq.info/get/bejne/kJiSoJt-v8-ql30.html

Link to ‘track topper?’

Use a block of wood or something, Not a screwdriver. Don't show people risky behavior.