What is the size measurements for a 260x vs. 297x u-joint, or what is a good way to tell if it is a 297 besides year. I am trying to buy some spare parts and the guy doesnt know if its 297 or 260

he says "What I came up with is the cap size is 1 1/8" and the over all with is 3 1/8" . Also I compared it to a Dana 44 axle that I have as well and they look to be the same size so they must be the large joint"

thanks

Andrew