I have three military driveshafts with the four bolt flange on each end that bolts to the 2.5 ton toploader axles. They are 26 1/2" collapsed and 29" extended. I believe they are 1410 series U-joints (4 3/16" wide). Joints still turn freely. If you are updating to Rockwells you need the 4-bolt flange at the end of your driveshafts. I also have just the flanges. I can ship to. Complete shaft $75.00. Flange only $25.00. E-mail: mn-scottw@bakerbearing.com or cell: (763)234-0942. Scott