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
Donepart 684ZZ Small Bearings 4mm x 9mm x 4mm Double Shielded and Pre-Lubricated Deep Groove Ball Bearing (20 Pcs): Amazon.com: Industrial & Scientific
KOYO 6004 C3 Deep Groove Ball Bearings 20x42x12mm Open, NO Seals: Amazon.com: Industrial & Scientific
10-Pack] 6004-ZZ - Deep Groove Radial Ball Bearing 20 mm x 42 mm x 12 mm (ID x OD x Width) Double Metal Shield with Clearance C3: Amazon.com: Industrial & Scientific