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Try Mid Fifty, Bob's F100 and others advertising in magazines like Classic Truck, etc. Mid Fifty has one that is not a duplicate of the original in their catalog for $79 ea. Bob's may have a used set. Also, keep an eye on Ebay under Ford F100.
Some of the people on this board doing Ranger and S-10 frame changes may have them available as they are only usable on 34" frame rails. I'm not sure but I suspect they are different than the F-100 and early F-150 frames.
Svoom,
How many brackets do you need? I have two left from when I installed the 55 tank under the drivers side and had to change them out. I think they are in good shape. Let me know if you are interested and I can dig them out and send you some pics.