Blade for lawn tractor mower mowers 1980 to 1996 for 42" double blade deck A: 540mm B: 10mm C: 8mm D: 64mm E: 3.5mm F: 75mm A: diagonal blade length B: centre hole dia. C: positioning hole dia. D: positioning hole dia. E: blade thickness F: blade width MTD Code: R301004 Original code: 9420721 7420721 AT