Not a bad list. I've heard of Brothers Auto Products - BAP
http://www.oldsparts.com/
BAP
7275 W. 162nd St. Suite 103
Stilwell, Kansas 66085
Phone: 913-851-7977
They sell on ebay, as does Fusick.
Some interior and 'hidden' body panels are common to Chevelles so local restoration suppliers may be cheaper on those items.
Don