John Deere Ignition Key Switch 
OEM Part Numbers: AR26528, AT21418
For John Deere Tractors: 1010 (Gas / LP; up to sn 51039), 2010 (Gas / LP; up to sn 055380), [ 3010, 4010 (Gas / LP) ], 3020 (Gas / LP; up to sn 067999), 4020 (Gas / LP; up to sn 090999)