Yes, those colors in the first post are super common. May not match oem colors, but if there was a working aftermarket radio in there already, it should match that color for color.
If you didn't live so dang far away, we could get together and repin those Molex connectors and make it look factory.
I need to do the whole install on my boat, yet. The dash is made for the old 2-post mount, but you just cannot find them anymore. I'm going to have to carve it out for a single DIN unit.