Sorry for my late reply, but here is what I used for my Robotron cabinet.
for the silver (sprayed on using a HVLP spray gun):

and the blue and red:

best picture I have of the cabinet ATM (I know, sorry made it a JROK multi-William, but it had none of the OEM hardware (got it as a Block Out) and hard to find the OEM board around where I live without pay excessive shipping costs from the US):
Edit: the blue looks weak in the picture, but it is like the cap color in the can pictured above. The colors were probably a close match to the red/blue in the marquee/bezel though looking at my pictures.

I can say that it looked awesome when the sun hit the paint with the metal flake that was in the silver and the red and blue really popped. How close there are to OEM I don't know, but it looked really good to me (and I am anal about such things). I was too cheap to buy the automotive paints CAN$100+ per can.
Note: if you like, I can find some card stock and spray the colors onto it and mail you a copy if you like so you can color match. Not sure how well it will work, but it is something I can do to help.

PM with your address.