Mtd OEM Replacement Blade 335-877
Requires 2 for 38'' deck; Hi-lift blade 
Length 19 3/8'' (492.1mm)
Centre Hole 3/8'' (9.5mm)
Outer Hole 5/16'' (7.9mm)
Centre Hole 2 1/2'' (63.5mm)
Width 3'' (76.2mm)
Thickness .149'' (3.8mm)