HUSQVARNA ROTARY MOWER BLADE FOR DIFFERENT MODELS MODEL - TECHNICAL SPECIFICATIONS LENGTH 426 mm CENTRAL BORE STAR , 5 prong OUTER BORE - mm CENTRAL BORE INDEX - mm CODE: 13270183 ORIGINAL CODE: 532 18 00-54 , 532 17 39-20 , 39 10 75-19 , 173920 , 180054 SR