Guess they were able to find that missing nut for your valve cover?
They pulled one off of a 540 at their shop; same piece. It's still down there...somewhere.
2003 ///M5 Sterling Gray Metallic
Evolve Stage 2 Header Power Tune
Evolve 4-1 ceramic coated long tube headers
Supersprint X-pipe, Vibrant mufflers
JB Racing flywheel, Evosport underdrive pulleys
ST coilovers, Dinan front strut tower brace and rear sway bar
BBS Motorsport GT4 wheels (18x9.5 front and 18x10 rear) with wheel stud conversion
Recaro Sportster CS seats, BMW short shifter with ZHP knob