If you have problems locating a door etc, The lower bottom inner and outer are available from:
Cross Canada Autobody Supply
5 Tilbury Court
Brampton, ON L6T 3T4
This is what I did on a '79 that I have, 'cause it is just a daily driver. Their stuff comes from Taiwan, the quality and fit is pretty good for what they cost. Don't have a website that I could find.