Attributes . 4 Bolt Round Flange Cartridge; 1-11/16" Bore; 5.1" Bolt Circle; 3.6" Bolt Spacing; 1 Piece Solid; Concentric Collar Mount; Cast Iron; Ball Bearing; 1-27/32" Length Thru Bore; Relubricatable; Double Land Riding Rubber Contact Seals . Names