So I got a couple jars of the Testors/Model Master #1782 Bright Brass paint and touched up my Brembos. I have to say that the color is barely close and I don't recommend it. You may be able to do some mixing with colors to get closer to the gold of the Brembos. I'll probably order some of the Humbrol 54 and finish my calipers. You can see in this photo that the Testors paint doesn't match perfectly but will be fine if you're not worried about a perfect color match, but from a few feet away you'd never tell the scratches are there.
Also, make sure to clean and prep the caliper surface before painting. Apparently I didn't prep all of my scratch spots perfectly because once I held the calipers to install them and the paint came off easily in a few areas as you can see. Once painted, brake cleaner doesn't help either.