Chevy4Life,
I've been looking for Rear Step Side Brackets for some time - Someone told me to call Bill Atheys. He is a board member and a site vendor. Price for Step Side was $60.00.
Here's his info.
ATHEYS CLASSIC TRUCK PARTS
803 North Royal Ave.
FRONT ROYAL VA 22630
Phone-540-636-7405
Fax-540-636-9693
http://www.s-c-t-p.com/index.html
I often see fleet side bumper brackets on eBay.