Be aware: If you enter keyword "6303RMX" into eBay or Amazon, you will note The provision of o.e.m measurement bearings - 10X42X13. "6303RMX" is stamped to the OEM idler #2 bearings. I have strong uncertainties about these staying high-quality bearings, such as the Koyo bearings labeled as being manufactured in https://exceeddirectory.com/listings752069/debt-collection-in-anaheim-an-overview