I live in Southern MN (Rochester to be exact) and was unaware of any local supplier for C10 parts. I thought it would be helpful to create a post for anyone in the future doing a search for parts suppliers in this area. The company is called Wheelers Autobody. They have locations in Rochester MN, Inver Grove Heights MN, Waterloo IA, and Ottumwa IA. I have no experience with them, I sold the gas tank from my truck through Craigslist and the buyer told me about them. I will definitely be checking them out and will post an update on my experience.
http://www.wheelersautobody.com/