What ard describes is exactly how mine were when I bought my 35d. I had to find a similar picture to realize what I was even missing. I ended up buying all 5 pieces (including the two small outer edge pieces). Now I get cool air coming through my interior vents rather than the hot engine compartment air.

AM.

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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)