A & B on commercial st & 30th runs alot of vans thru there yard. https://www.abtruckparts.com/
Go there & tell them what you need, they put it on a list they have & will call when your parts come in.
You can make door panels very easy ... a 1/8" Masonite & you choose what mat'l you want to cover them. A little spray glue & wa la new door panels. I thought they were going to be a bit*h to make & before I knew it they were done.