Double Row Bearings offered at USA Bearings & Belts, and on our web page www.usabearingsandbelts.com and www.mybearingstore.com. They can be numbered as 5200 Bearings and are available as a rubber sealed or metal Shielded bearing and numbered 5301, 5302,5303, 5304, 5305, 5306, 5307, 5308, 5310, 5312. These Bearings are distributed by USA Bearings & Belts at their website www.usabearingsandbelts.com and www.mybearingstore.com. 2RS/RS on our site means Rubber seals on each side of the bearing. ZZ/Z at USA Bearings & Belts means Metal Shields on each side of the bearing.