Take note: In case you enter search phrase "6303RMX" into eBay or Amazon, you will note the availability of OEM sizing bearings - 10X42X13. "6303RMX" is stamped around the OEM idler #two bearings. I have solid doubts about these currently being top quality bearings, such as the Koyo bearings labeled https://one-directory.com/listings733948/what-does-debt-collectors-companies-in-anaheim-mean