Try A1 partsmart in austin, they should be able to get you what you want.
I also got my truck tuned finally and a Nelson Fan Harness for my electric fans. Now I just need to find some LS1 fans.
The truck is a completely different animal after the tune, it will break the 37s loose on dry pavement. Some of my buddies are coming into texas next month and we are planning a work weekend on my rig, I have a decent list of some things I need to do...
Cut the front coils and reposition the air bumps to lose about 1.5 inches of height in the front
Add a long secondary leaf to the rear to gain some load carrying capacity and height
Drop the trac bar mount about 1 inch
Regear the front axle and replace the seals
Install my posi lock and front diff actuator
Lengthen the front shaft and check clearances
Finish my front bumper and paint it
Mount and wire my winch in the bumper
Build a rear bumper as well
I'm really thinking about building a swing out tire carrier for the rear, instead of putting my spare on the roof rack to gain some weight over the rear tires? But that does mean buying another $300 tire and $200 wheel, that dang never ending vicious cycle