There are more than 4 screws, and most of the time they are burried in the plastic. The heads are 5/16" and there is one that holds the vent cable that also needs to be removed, or you will break the plastic cable housing. The factory used a ton of grey putty to seal them in place so you will have to fight with them a bit. If I remember you have to push them towords the firewall to get the front part out and then slide it out.
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