Yes indeed. Spoke to a dealer who consulted HD parts net and discovered that front engine mount part number 16207-79B is also listed as Buell part L0501.2.
At the same time, found a posting on
www.badweatherbikers.com (a very useful US Buell resource site for those of you that have not found it yet...) dated Dec'05 saying that there was a Buell Parts And Accessories Bulletin number 32 stating that 16207-79B is replaced by L0501.2 for certain Buell (Tuber) applications. Neither revision 16207-79C nor 16207-79D will fit if like me you have a tuber of 'a certain age' that wants a 16207-79B replacement!
Hope this helps prevent someone from getting stuck. I am now waiting for the RIGHT part from the aforesaid dealer who should have known his onions. In fairness, the parts book does say that 16207-79D is the correct part (albeit for various other Buells - mostly XBs). Perhaps the moral of the story is to persuade your dealer to double check Buell parts orders on the HD parts net?
Off to put the old bush back in just to hold the engine up for the time being...