Not a big fan of Duplicolor, but whatever. Be aware there are a ton of different silvers out there. At best you'll be walking back and forth trying to get a cap to match as close as you can, expect that.
It's getting harder and harder to get, but in AZ you might be able to, I'd go for real auto paint. Yeah, it's a pain, it's 2K so you have to mix it, or at least the clear and single stage is really hard to find, let alone match. There's an assortment of options to spray it, you don't need a compressor, Preval is one. But it's going to be a PITA, just be aware. I've got bad paint on mine too and I'm reviewing options, I'm probably going to go to a darker gray on my silver truck, just for a little contrast. That machined aluminum finish is going to be real hard to find let alone duplicate.