How do I fix my armrests, and how do I protect my dash?

A couple questions that I think should be easy for some of you here. I'm missing one arm rest for my 1970 duster and the other seems to be held on with duct tape. How do I properly secure these on? The armrests are one of three small things that prevent my interior from being perfect. Oh, and if someone has a black driver side armrest for sale please let me know...




Next question: my dash is perfect. How do I make it stay that way? The car has been garaged its whole life and it will continue to be garaged but I want to take whatever steps I can to preserve it, if anything else can be done. Is there a product that you guys can recommend, like armorall? I have seen some people claim that this is actually worse for the dash in the long run, so I don't know.