1998 jeep Cherokee A/C housing
 

I have been working on changing out my heater core for the first time and i came across a little problem. I finally got to the big black a/c housing box and pulled it out. As soon as i pulled the halves apart a couple a/c door panels fell out. After exchanging heater cores, i put all of the panels back where they came from.. all except ONE. Can anyone please tell me where the heck this piece goes back to?
https://cimg0.ibsrv.net/gimg/www.che...208701ec21.jpg

Where does this one belong? One side


https://cimg2.ibsrv.net/gimg/www.che...e35aca2add.jpg

Other side


https://cimg5.ibsrv.net/gimg/www.che...259b15684d.jpg

One half of the housing box


https://cimg7.ibsrv.net/gimg/www.che...9574e429aa.jpg

2nd half of the housing box (side i believe that piece fell from but i could be wrong)