1969 Front fender brace finish

What is the proper finish for the front fender braces?
This is the piece that attaches between the front bumper bracket and the lower front portion of the fender.

I am going to say satin black. I have mine powder coated for a lasting finish.

Slop gray is the color those brackets were painted in '69.

Does it matter which plant it was produced at ? Seems like gray was the default for Dearborn but San Jose used black ? Vague memories of reading something along those lines …

See below link courtesy of J_Speegle and the Concours Mustang Forum!

http://concoursmustang.com/speegle/Articles/69/Article-69-70BatchIllustrated%201B.pdf