Coutax OEM Replacement Blade 305-0789 
FIT MODELS: 16000200, HGM machines, 36'' (0.91m) and 42'' (1.07m); left hand blade 
Length 12 11/16'' (322mm)
Centre 3/8'' (10.2mm)
Outer Holes 5/32 x 5/16'' (4mm x 8.5mm)
Centre 1 3/4'' x 1 13/16'' (44.5mm x 46.5mm)
Width 2 13/16'' (76mm)
Thickness 5/32'' (4mm)