Touch up paint for Preamplifier ?

Does anybody have a suggestion for a paint color (and source) that comes close to the color of the stock metal that almost every black Amplifier and Preamplifier case is made out of in the 1908s-today ?

I’m looking at creating a custom stainless steel "open cover" for my tube preamp that will provide more ventilation and would like to paint it in a color that would closely match the rest of the OEM case.

Unfortunately, I can’t really make the open cover out of the stock metal used in most preamp/amp cases so it is going to have to be painted to match.

I’m hoping that some company makes a paint that would be used to cosmetically touch up preamp/amps that have been scratched or damaged.... but so far I’ve struck out in finding something like that.

It happens to be a BAT preamp, but the same metal used in the BAT preamp case appears to be very similar to metal used Mcintosh, Denon, Marantz, Yahama, and almost every other brand.

Any suggestions would be most appreciated !