I've had good luck with Truck Shop out of Orange, CA. However, I've heard from other 'bolters that you need to know exactly what you need/want when you order. I haven't experienced that - I've been really happy with all my purchases. Plus, they're having a 10% off weekend sale Nov 25/26.
www.truckandcarshop.com I've had good luck with American Classic also. I was pleased with their promptness and product quality.
Remember to check out the "links" part of this site. It has a terrific list of vendors. (That's it, right at the very top of this page.)