My experience has been that U joints are fairly generic. Pull the old one out and take it to NAPA, or an "old" parts store. they will measure cap diameter and distance across the caps, and give you the correct one. If you want to measure yourself, do a quick internet search for universal joint dimensions. https://www.currieenterprises.com/understanding-u-joints

As with all of our trucks, you never know what was changed since new!

Jon