____Driveshaft Question??

The measurement was the from the front end of the end cap to the rear end of the end cap. My dad has a '74 Duster same trans, with an 8 1/4. I'm sure I can use the measuremets off the Duster to give to the driveshaft shop?? I also think I need to see if the u-joint will fit the pinion yoke, correct?