I have no idea where to find the exact paint but I have used Rust-Oleum Silver Metallic before and really liked the results. It is really as close to factory as I can find.
Usually 2 to 3 hundred for 4 radius rods and 2 trailing arms and sometimes a cylinder head, lol
I just usually have him match whatever color is on the parts I bring him (SRX), or they get turned black (everything else)
I had everything from my SRX sand blasted and then powder coated silver, turned out pretty nice with new stickers, didn't bother too much with paint codes and exact matching of the color.