Why not just use the tried and true product from Totally Auto Cost?
I don't think the Totally Auto paint is an exact match to the factory original argent. I think it was Scott Smith that started a post on Moparts years ago that showed the differences. He was trying to find a more correct paint. He found four or five different Krylon shades and did a sprayout off all of them. I think he compared the Krylon to some NOS argent maybe? Anyway, in Scott's opinion, the Krylon was a closer match then the Totally Auto paint.
Then there is the cost. A lot of people complained of the high cost, then their can clogged and wouldn't spray.