There are many reviews and several videos on U-tubes that say you have to take it out of the plastic case it comes in in order for it to fit in the car. It's not the case :) especially since the 2003 Lesabre it just slipped right in. I also glued the edge with two holes because there was a small gap and it didn't go all the way. You have to press it really hard and hold for a minute as the filter media doesn't like glue. Let it dry for 48 hours to be on the safe side to prevent superglue smell from getting through the vents and you're good to go. Solid replacement.
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