Are there a lot of differant size U-joints for the bolens tractors ?? My local dis. is trying to sell me 1" cup diameter u-joints where I saw one with a .996 diameter.. Now I know that is only 4 thou,,But correct IS correct..I've been looking at all the manuals you good people have listed in GTT but can't find any sizes of U-joints.. I have a 1477 husky large frame.. And the only PT # I could find is 1724401... Is that for all Joints on all the shafts for most bolens ?? My local dis. looked at that # and shrugged his shoulders and got out a caliper.. Doe's anyone have the EXACT measurments of a 1724401--( if that is standard ) and post it ?? ALSO-- What doe's the 6N,, or 6LN,, N10,, or some of the other #'s I see stamped on universals.. Is there a chart that tells you a size by that ##..?