MULCHING BLADE KNIFE FOR ROTARY MOWER, TOUCHER, MOWER CUTTER GARTENLAND FOR MODELS GL17.5-107H , GL17.5-107T MODEL - TECHNICAL SPECIFICATIONS LENGTH 540 mm CENTRAL BORE Saddle , 6 prong OUTSIDE BORE 7.9 mm CENTRAL BORE INDEX - mm 63.5 CODE: 13271453 ORIGINAL CODE: 742-0674-637 , 742-0674 SR