We are proud to announce our very own drop in Cabin Filter Door for the Trailblazer platform! This will also fit 02-'09 GMT 360/370 vehicles (Chevy Trailblazer, GMC Envoy, Buick Rainier, Olds Bravada, and Isuzu Ascender). 
 
Each of these are 3D printed in house, then have foam installed to ensure a snug fitment. Not pictured, but included is a single screw to allow the door to be installed the same way the OEM version is. 
 
** These are 3D printed in house and made to order. Color may vary than what is photographed based of material color available at the time of printing. These are not seen once installed. These take several hours to create so please factor in a day or two for order processing. **
 
Many of the GM vehicles of this platform did not come with a cabin filter from the factory, but the spot is there on the HVAC ducting. This is under the dash on the passenger side. Some trimming with a razor blade and you are good to go for installing a set of filters. 
 
Photo instructions is included with each filter door. 
 
FRAM CF8791A Filters can be grabbed on amazon via the link here (non-affiliate)
https://smile.amazon.com/gp/product/B0010DW5ZO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1