6004 ZC3 Nachi Ball Bearing Open ONE Side Japan 20x42x12mm Made in Japan: Amazon.com: Industrial & Scientific
2PACK TIMKEN 6004-ZZ Double Metal Seal Bearings 20x42x12mm, Pre-Lubricated and Stable Performance and Cost Effective, Deep Groove Ball Bearings.: Amazon.com: Industrial & Scientific
2PACK TIMKEN 6004-2RS Double Rubber Seal Bearings 20x42x12mm, Pre-Lubricated and Stable Performance and Cost Effective, Deep Groove Ball Bearings: Amazon.com: Industrial & Scientific