SKH / SKM Series SB3745 Axial 370mm Disc (up to 05/2003) Knorr SB6 / SN6 K013173 SN6570RC 0536270371 1 TRX6570RC K013174 SN6580RC 0536270361 2 TRX6580RC SH / SM Series SB4345 Axial 430mm Disc (up to 05/2003) Knorr SB7 / SN7 K003803 SN7186RC 0536270381 1 TRX7186RC K003804 SN7196RC 0536270391 2 TRX7196RC SKH / SKM Series SB3745T Tangential 370mm Disc (up to 05/2003) Knorr SB6 / SN6 K013173 SN6570RC 0536270603 1 TRX6570RC K013174 SN6580RC 0536270613 2 TRX6580RC SK / SM Series SB4309T Tangential 430mm Disc (up to 05/2003) Knorr SK7 K012634 SK7052RC 0536270620 1 TRX7052RC K012633 SK7042RC 0536270630 2 TRX7042RC SK / SM Series SB4345T Tangential 430mm Disc (up to 05/2003) Knorr SB7 / SN7 K003803 SN7186RC 0536270640 1 TRX7186RC K003804 SN7196RC 0536270650 2 TRX7196RC Steering Axle SB3745370mm Disc (up to 05/2003) Knorr SB6 / SN6 K002924 SB6411RC 0536270411 1 TRX6411RC K002923 SB6401RC 0536270401 2 TRX6401RC