Be aware: When you enter search phrase "6303RMX" into eBay or Amazon, you will see the availability of OEM sizing bearings - 10X42X13. "6303RMX" is stamped within the OEM idler #two bearings. I've robust uncertainties about these being good quality bearings, including the Koyo bearings labeled as currently being created https://gen-directory.com/listings13212793/credit-recovery-agency-in-anaheim-no-further-a-mystery