Premium Quality Replacement Part. Mower Deck Spindle Assembly. Compatible with Ariens Models: 34″ Walk-Behind Mower 911371 14.5hp B&S (Sn: 000101 & Above) 911410 13.5hp B&S (Sn: 000101 & Above) 911413 14.5hp B&S (Sn: 000101 & Above) Zoom 34″ Zero-Turn Mower 915131 13hp B&S (Sn: 000101 & Above) 915151 13hp B&S (Sn: 000101 & Above) 915157 14hp B&S (Sn: 000101 & Above) 915169 14hp B&S (Sn: 000101 – 009999) 915322 16hp B&S (Sn: 000101 – 009999) 915322 16hp B&S (Sn: 030000 – 034999) Zoom 50 Zero-Turn Mower 915143 22hp Kw. (Sn: 000101 & Above) 915161 25hp Koh. (Sn: 000101 & Above). Compatible with Gravely Models: 34″ Walk-Behind Mower 911372 (Waw 34) 14.5hp B&S (Sn: 000101 & Above) 34″ Wide-Area Walk-Behind Mower 911411 (Waw 34) 13.5hp B&S (Sn: 000101 & Above) 911412 (Waw 34) 14.5hp B&S (Sn: 000101 & Above) 34″ Zero-Turn Mower 915130 (Zt 1334) 13hp B&S (Sn: 000101 & Above) 915146 (Zt 34) (Sn: 000101 – 034999) 915146 (Zt 34) (Sn: 035000 & Above) 915168 (Zt 34) (Sn: 000101 – 034999) 915168 (Zt 34) (Sn: 035000 & Above) 915327 (Zt 34) 16hp B&S (Sn: 020000 – 034999) 50″ Zero-Turn Mower 915144 (Zt 50) B&S (Sn: 000101 & Above) 915150 (Zt 50) (Sn: 000101 & Above) 915180 (Zt 50) Koh. (Sn: 035000 & Above) 915192 (Zt 50) Koh. 2x Deck Spindle Assembly: Ariens: 51519500, 61559900. 135 mm – 5.31 in. 88 mm – 3.46 in. Pulley Diameter: 122 mm – 4.8 in. Stud Diameter: 16 mm – 0.62 in.