Honda OEM Replacement Blade 305-1069
FITS MODELS: HRX 537C, HRX 537C1, HRX 537C2, IZY 53
Length 20 15/16'' (532mm)
Centre Hole 1 3/16'' (21mm) 
Outer Hole 13/32'' (10.4mm) 
Centre 3 1/2'' (88mm)
Width 3 5/32'' (80mm)
Thickness 1/8'' (3mm)