If I'm not mistaken....there is an updated blend door "housing" assembly for that year 05/06 truck....?? I can check tomorrow when I get to work if you want? To help clarify, I would just need the last 8 digits of your VIN and can tell you for sure....?

"Fat drunk and stupid is no way to go through life son......"

http://www.youtube.com/watch?v=bK-Dqj4fHmM