Are looking for a new or used?
Look here
www.yearone.com www.lmctruck.com or
www.cheyennetruck.com.
You can also call the local body shops. Ask them where they buy their parts. They usually use local warehouses that probably stock or can order the parts you need.
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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/