It took a few weeks but I finally got them both rebuilt and repainted. These are the two piece design which requires you to take them apart to replace the seals. It wasn't that bad honestly. I didn't take the metal frame off the vent window itself. I just taped the windows up to prevent damage to the tint or glass.
I ended up using Acrylic Lacquer paint that I found at O'Reilly's. Use the Duplicolor brand. It sprays so much easier and better than the Rustoleum brand I used first. This is the same paint that's available in the color match paints Duplicolor sells. I just used generic gloss black which was cheaper and in a bigger can than the color match stuff. I wet sanded, buffed, and polished everything by hand. I'm so exited at how well these spray painted parts turned out.