blades for mower cutter blades MTD YARD MAN GUTBORD for models 53PO , 53SPB , 53SPO , 478SP , 530HM , BL5053 , BL5300 , GES53 , G55 , HB53RT , HBM53 , LR55 , SP530 , YM5521 , YM062 MODEL - TECHNICAL SPECIFICATIONS LENGTH 515 mm CENTRAL BORE 4-point star EXTERNAL BORE 7. 5 mm CENTRAL HOLE INTERAXIS 63.5 mm CODE: 13286622 ORIGINAL CODE 742-04364 , 742-0828 SR