Purchase this filter at: https://filterheads.com/products/cabin-air-filter-air-qualitee-aq1035

AQ1035 filter fits:
Buick LeSabre 2000 - 2005

Cadillac DeVille 2000 - 2005
Cadillac DTS 2006 - 2011

Oldsmobile Aurora 2001 - 2003

Pontiac Bonneville 2000 - 2005

The model shown in this video is a 2002 Cadillac DeVille but installation is similar on the other models.