Somewhere between setting doors and windows and internal framing I finished off the second unit and now they are waiting to be mounted on the car.

RB, the projector is mounted on four studs which are screwed into the oem shroud from the back. Those studs are screwed into four little cylindrical protrusions (for lack of a better word). I simply shortened the protrusions and refitted the studs. Then the front of the shroud has to be drilled out to get the projector to stick out through it so that you can slip the M3 shrouds onto to the projectors. Pictures of this are on page #2 of this thread.

I am going to fit mine when I do the chain guides and valve cover gaskets.

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.