I just happened to be in the EPC when I saw this question.

Not sure if I can shed any light on the 05 vs 06 issue but there appears to be a couple of variations on both the bolt that holds down the bracket and the actual bracket the holds down the injector.

The VIN I used to access the EPC was from an 06 CDI and according to the EPC the part number for the bolt is 000 990 29 07 - the EPC calls this bolt 'Capscrew with hexal drive' when I turn off the model year filters for 06 there is another part number that also appears 004 990 28 12 and its simply called a 'bolt'.

There are 3 different versions of the clamping bracket listed, the most recent appears to be 611 017 05 39 and there are two earlier versions 611 017 02 39 and 611 016 07 38. The most recent and 2nd most recent version are labeled 'Clamping bracket - forged version' and the first version is simply labeled
'bracket'

So it would appear that there were a couple of updates to both the bracket and bolt. As they say in Mythbusters... I'd call it plausible.

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