BTW: While at the parts counter these 'convertion u-joints' are actually called "Bastard Joints".
Getting the right parts from a McDonalds reject can be a pain if you use the wrong terminology. They aren't exactly known for being rich in common sense.
I had to find a bastard joint for connecting a 1/2 ton chevy driveshaft to a 1 ton Furd (HPD60) front end.