BELT TENSIONING PULLEY FOR RIDE-ON MOWER LAWN MOWER COMPATIBLE WITH ALPINA STIGA TECHNICAL SPECIFICATIONS ALPINA MODELS : Primo , Estate Basic , Estate Collector , Estate President , Estate Senato , Estate Tornado OUTER DIAMETER 63 mm INNER DIAMETER 15 mm HEIGHT 20 mm CODE: 31270082 ORIGINAL CODE: 125601588/0 , 52601576/0 , 1134-6516-01 SR