Description Weasler Forged 3500 Series Tractor PTO Yoke - 1 3/8", 21 spline Quick Disconnect. This item is a suitable alternative for the following: 971-1023521, 102-3521, 1023521, 340-3503, 35N220TQD, A-102-3521, A1023521, C124ARC, C124A-RC