Note: Should you enter keyword "6303RMX" into eBay or Amazon, you will notice the availability of o.e.m size bearings - 10X42X13. "6303RMX" is stamped about the OEM idler #2 bearings. I have solid doubts about these staying quality bearings, such as the Koyo bearings labeled as becoming manufactured in Japan https://gen-directory.com/listings13212793/credit-recovery-agency-in-anaheim-no-further-a-mystery