You can do what I've done and ask a trophy shop or a T-shirt shop to make them for you. A T-shirt shop did the lettering in the photo below. They reverse printed on the back of a piece of plexiglass and then I painted gold over the lettering. The down side of this process was that the paint can dissolve the ink if it is sprayed on too heavily. This required me to shoot several very thin mist-like coats to prevent this. On my next attempt I had a trophy shop make the plate from a sheet of material they use to make name plates on trophies. It's a metal covered laminate of some kind that they use. I forget the name they use for the inking process. Since the ink was on the plate all I had to do was cut a matching piece of plexi to protect the front panel of the amp. This isn't real practical if you have them make a single piece for you due to the cost. For this reason you might want to make several and sell what you don't need.