Blade for lawn tractor lawn mower since 1997 21" flat blade and rectangular attachment A: 535mm B: 6 pins C: 8mm D: 63mm E: 3.5mm F: 52mm A: diagonal blade length B: centre hole dia. C: positioning hole dia. D: positioning hole dia. E: blade thickness F: blade width MTD Code: R302655 Original code: 9420641 7420641 AT