Pasi,

Using the current light Argent paints on the market are too light for the GC, and the Dark Argents are too dark for a correct look, I would suggest you contact Totally Auto, and try to purchase a quart can of their LIGHT ARGENT, and their DARK ARGENT, and attempt a custom blend/mixing and spray out to achieve the desired results, no one to my knowledge offers an Argent in the "medium" color range

Mike