Thank you for the input, Gi60. You being a detailer will be a handy guy to have around! .Not sure, but Rustoleum makes a pretty comprehensive line of medium to dark metallic greys. I have most of them for different trim projects on cars and household pieces. If you went to Lowes or Home Depot, you can no doubt find something that is pretty close. You're trying to match to parts that aren't immediately adjacent to the tank, so if it's not perfect, it's not going to be a glaring difference.
Off the top of my head, I'd look at "soft iron grey", which is a flat. The frustrating thing is that their colors in those greys run from flat to gloss.
I think I may run to town tomorrow for some errands, and paint will be one of them. I'm hoping I may be able to get a decent pic with my phone....at least close enough to grab a couple/three cans of something close. I'd like to try to find more than a satin, than a matte. Give it a tad of glow. My first thought was to black them out, but I've "murdered out" so many black bikes, I want some contrast for a change. Going black is the easy way out.
I'll be looking for some treatment for this satin/matte finish also. Once Summer gets here, as you know, our CA sun can be brutal on finishes.