12 Series Yoke & Shaft Assembly. 1" x 1-1/8" rectangular shaft. Center Line to end length is 37.38". New 6 Series Yoke & Shaft Assembly. ¾" x 7/8" Shaft. CL to End is 38.75". (CL to end length is the distance from the holes in the yoke to the end of the shaft). Replaces Neapco No. 65-1639. Fits Case-IH, John Day, and Woods models.