If you are just looking for the cab with doors and not the whole truck, There are a couple of guys just north of Detroit that sell alot of Arizona and Texas stuff. Been to both places and they both have the cabs with doors.
1) Cliff's Truckin' Heaven call 1-888-268-9588
ask for Cliff (nice old guy)
2)Southern Truck call 810-724-2357
3)or check this site
www.rustfreebodyparts.com
email:
thechop1344@earthlink.net
in Atlanta Ga. area but delivers to midwest