Loose interior pieces

The previous owner of my car (My brother) put in a new sound system. In doing so, he pretty much screwed up the interior pieces. Like, the armrests and stuff on the panels are all lose. The plastic things that hold them together (I think male/female) have been broken off. I was wondering how I can get it solid again? Take the panel off, and weld some new brackets? Any ideas? Oh yeah, I need a rear view mirror. I hear they have those at AutoZone, but they're just generic. If anybody's parting out or whater and has one, let me know. Thanks

It might be easier to get replacement panels and mirror at a junkyard. You can try to super glue or plastic weld the tabs back but it probably won't last since quite a bit of force against them is used when you pull the door closed. Just my $.02.