I am curious too, I actually went out to the garage this morning to check on my brackets (11/02/66 SJ actual build date)
for whatever reason, I did not locate them after searching all of my "baggies" and "boxes". (I did locate something I couldn't find on Monday though, doing the same shake-down lol!) Once I do locate them, I have this thread flagged and will supply what I have found out. This area would be "unrestored" previous to my disassembly, worst case scenario would be I shot paint over outside surface during a 1997 refresh but the faces against the frame will be what I focus on mostly, those had never been taken loose before last year's disassemble. Memory tells me they were bare steel, memory also tells me I only previously repainted under the hood since this car was kept in California desert it's whole life, this area and underside of my car were untouched before this resoration.
I'll update when I find them.