hey guys, back for more advice. I took my car to my mechanic and he called me in and told me that there were a lot of spiders and dirt in my car, ans well as the rear seats were blackened and smells . He assumes a water leak and told me Im missing my driver door weather guard and the weather trim around my door. any DIY guys want to help me guide through replace the weather moldings? Any suggestions as to what i should do.

Ps no rust spots

 

... replace the missing trim