Well, I went to napa to get a changeover ujoint. 1350 to a 1310 for my mudbog truck cause I heard that they had them in stock. The factory sales rep was there too doing a sales call. The owner, Frank, did some measurements, pulled out a slide chart, hummed, ho'd and ha'd and said they didn't make what I needed according to his chart.
Ok, so the sales rep looks at it and says to frank, "I think we make it, but you need the new book we have, I don't have one but I'll send you one".
Ok, so off I go to albuquerque to U-joints Inc, which is 75 miles one way. Take my driveline and yoke and tell him what I'm trying to do. He says, you want the change over u-joint or a new driveline yoke, same price $38 and then you can use a standard ujoint. Bingo, bought the yokes and new u-joints for the front and the back, to change to a 1350 in the back and a 1310 in the front, so now even autozone and napa can't screw it up.
Then he tells me that the ujoints are just in different series with either inner or outer clips, simple, and they make change over u-joints in many applications and gives me a card to call them. I can order over the phone, and they'll ship it to me ups.