6904DW AB Alternator Bearing 18.7x37x9 Open6904DW AB Open Alternator Ball Bearing 18. 7mm x 37mm x 9mm One Bearing 6904DW AB Open Alternator Ball Bearing, bearing is made from Chrome Steel. inner diameter is 18. 7mm, outer diameter is 37mm and Width is 9mm. Item: 6904DW AB Ball Bearing Type: Deep Groove Ball Bearing Closures: Open Size: 18. 7mm x 37mm x 9mm Inner Diameter: 18. 7mm Outer Diameter: 37mm Width: 9mm Quantity: One Bearing