ROTARY MOWER BLADE MTD YARD MAN GUTBORD FOR MODELS 45 B , 445HR4 , B450 , ECOB, HB45 , HB45E , HB45R , HR46R , HB46-2 MODEL - TECHNICAL SPECIFICATIONS LENGTH 448 mm CENTRAL BORE 10 mm OUTSIDE BORE - mm INDEX CENTRAL BORES - mm CODE: 13270738 ORIGINAL CODE 079. 77.310 , 079.77879 , 079.77.878 , 079.77.601 , 073.35.204 SR