I'd suggest taking a trip to your local Parker store and see if there is a BPP fitting that has the correct thread size. I did that once but can't remember which of the pretty many BMW models I did that for.

__________________
2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,