Notice: If you enter search phrase "6303RMX" into eBay or Amazon, you will see the availability of o.e.m size bearings - 10X42X13. "6303RMX" is stamped on the OEM idler #two bearings. I've potent uncertainties about these getting quality bearings, such as the Koyo bearings labeled as remaining designed in Japan https://directoryorg.com/listings13221010/the-ultimate-guide-to-debt-collectors-companies-in-anaheim