Mtd OEM Replacement Blade 335-665
FITS MODELS: Bowtie style centre hole, 1997 and newer, 11A-020B352 with 20'' decks 
Hi-lift blade 
Length 20'' (508mm)
Centre Hole 1 x 3/4'' (25.4mm)
Outer Hole 5/16'' (19mm)
Centre 2 1/2'' (63.5mm)
Width 2 1/'' (63.5mm)
Thickness .134'' (4.2mm)