Wow nice hardware!
I had the same hardware issue with the cream pickup mounts on the flat black one with the orange stripe earlier in this thread. I hit them with white knight sls etch primer and epoxy gloss black. Lasted ok for a while, bit a couple of years in and the bottom edge of the bridge one has worn through. Would be a good stop gap fix until you can source black ones. If you do please let me know as I couldn't find any.