I installed and 8 3/4 in my dart from a 67 coronet. I got a 7260 to 7290 conversion ujoint precision #347. Well it does fit in the yoke on the third member. What gives
You need to be more specific. And the pics you posted don't help much. Cant really tell the exact sizes with a tape measure and the straps on. What about it is wrong that it doesn't fit? Here's a yoke I.D. chart I made up in PDF form that may help