GM did have some the time I looked but that about Two yr ago GM dealer might still have some on the shelf, LMC http://www.lmctruck.com or Gas tank shop should be able to get them for you. LMC does have these listed in there book they will send you a free book.
You may have to find those brackets used. To my knowledge there isn't anyone reproducing those brackets at this time. There is a web site you can go to to find used parts for your truck. It's called car-parts.com, it's a nation wide locator for used parts. Good luck on your search!
just the straps Just the straps right here on this site pg 49 top 24.95 1973-1987 cat.http://www.classicparts.com
