Neapco 1310 Series 1 3/8" x 16 Spline Slip Yoke.
Neapco Part # 2-3-8021kx.
Measurements: 16 splines and 1.375 inch spline diameter. 7.875 inches from center of u-joint bearing cap to end of yoke.
Made to fit a 1310 Series U-joint with the measurements of: 3 7/32 inches between snap rings, 1 1/16 diameter bearing caps.