300tdi fan belt tensioner

Hi. Am in the the middle of fitting another 300 tdi to my discovery, and have noticed that the long threaded bolt isn't there that the tentioner slides on and you then put the nut on. Has it always been the same design or was it changed to a bolt at some point? that goes through the tentioner. Thanks

According to my parts catalogue the tensioner is placed on an M10 x 75 stud TE110151.There are no change points for this part, also required an M10 flanged nut, FN110047.

Ok thanks for that. Didn't think they would change it.