1)spring Ring Diameter 104 Of Center Adjus [Spring Ring Diameter 104 Of Center Adjustment Device For Schaku Coupler As Per Item No. 12 Of Schaku Drg. No. 40 1000.10(2) Or Similar. The Drawings Submitted By The Bidders Must Be Approved By Rdso.] 2)spring Washer A16 For Schaku Coupler Of [Spring Washer A16 For Schaku Coupler Of Emu Coaches To Item No. 13 Of Schaku Drg. No. 40 586.06(2) Or Similar. The Drawings Submitted By The Bidders Must Be Approved By Rdso ]