This is the perfect size for your SPEC E46 BMW.
Racequip 725005 Window Safety Net Ribbon Style Black SFI 27.1 Certified 18 Inches High X 24 Inches Wide Constructed of Premium 1 Inch Polypropylene Webbing, Jig-built for consistency.
RaceQuip Ribbon Window Nets are constructed of heavy-duty 1" polypropylene webbing and nylon thread for maximum durability. For over a decade, RaceQuip has utilized jig-built construction techniques which ensure consistent size, shape, and fit. Size is 18" High X 24" .Wide which is standard and will fit most window openings. Exceeds SFI 27.1 specifications.