Hippie,
take a look at the
www.4x4Wire.com Isuzu pages, and then the
www.planetisuzoo.com pages.
For OEM parts, there's St. Charles Isuzu in St. Louis, MO. Merlin is the parts wizard.
http://isuzu.stcharlesauto.com/Department-Parts.aspx
Jerry Lemond (I think he's in Atlanta, GA) also is a good source of OEM parts. You can find him on the 4x4Wire forums by using the "search" function.
Also on those sights you will find some fellow Texas Isuzu enthusiasts. There are some well built Isuzu's there!