Ok, I'm pretty sure it is a 1 5/16 socket. But, the socket I have is a thick wall socket and won't fit into the yoke. Of course a trip to Sears, Monument Auto, Kragen Auto, Napa Auto, Home Depot, and Lowe's turns up no 1 5/16 thin wall sockets. This is irritating to no end. Is there a MM equivalent? I wanted to get the driveshaft in today but that is down the crapper. Also, I go to do the install and can't find my bolts for the Corp14ff yoke. That is because I am looking for the U-bolt style ones and forgot that it has the strap style yoke. I read a write up on Pirate about swapping to a 1410 yoke ala HAD but since I already have the new 1350 driveshaft, does Spicer make a 1350 yoke for the Corp14ff that is the U-bolt style instead of the straps?