Be aware: Should you enter search term "6303RMX" into eBay or Amazon, you will notice the availability of OEM size bearings - 10X42X13. "6303RMX" is stamped around the OEM idler #two bearings. I've powerful doubts about these becoming high quality bearings, including the Koyo bearings labeled as becoming manufactured in https://123-directory.com/listings13195498/about-debt-collection-service-in-anaheim