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
Koyo 6004-2RS Single Row Ball Bearing: Deep Groove Ball Bearings: Amazon.com: Industrial & Scientific
Amazon.com: Rannb 6004RS Ball Bearings Double Sealed Steel Bearings 20mm x 42mm x 12mm- Pack of 5 : Industrial & Scientific