Note: Should you enter key phrase "6303RMX" into eBay or Amazon, you will see The supply of OEM sizing bearings - 10X42X13. "6303RMX" is stamped on the OEM idler #2 bearings. I have strong doubts about these being high quality bearings, such as the Koyo bearings labeled as being built https://directorypile.com/listings13189171/the-smart-trick-of-debt-recovery-and-collection-in-anaheim-that-nobody-is-discussing