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Another option is to search google for "5-213x u-bolts". That Universal is a 5-213X so that will turn up some u-bolts that look just like the ones you received. It is likely the guy is selling a generic u-bolt. You can confirm the u-joint with some measurements if you don't have the number...

Looking in the couple TM's I have I found the part number you listed for both the front and rear (some models) drive shaft. I checked a different TM and found a part that matched "12339050" but had a different NSN 5306-01-502-3440 and it looks like the guy on epay you bought them from also has...