How to restore a 1967 A body console

How can i restore my 1967 A body console, it has one piece broke off that i have, how do i reattach it, also has several other places with broke off plastic on the bottom, but don't have them, how can i replace them, and can i somehow rejuvenate the old plastic so its not as brittle, want to get this restored for my 1970 duster, but want to do it myself.