It is well known in bimmerforums E39 section for the last 10 yrs, ppl have used the Mercedes M11 head bolts in the M54 aluminum block w/o issues.

The videos I listed above are there to show the tools/techniques, whether it is M50, M52 (Iron Block) vs M54 (Aluminum).

The M11 idea is to get rid of the "middleman", which is Timesert.

Of course one can use Timesert too, but be careful drilling the holes larger to accept Timesert sleeve. There is not much room there.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT