What do you mean? If you want nickel look you need to replace all of them, right? We had the same brass looking stuff and just painted them all flat black, $1.00 a can at the Po. No way was I spending $200 plus for that. I repainted 3 or 4 of the most used ones a year later.
I also painted some of the residential style light fixtures and painted the ceiling fan a flat greenish color. $5.00 done.
I also use that $1 flat black on the part of the frame that shows and the running gear, stabilizers etc. Flat hides imperfections vs gloss showing them.
