I'm looking to paint the two engines on the Liberty that are not painted. Does anyone know a relatively close match for the dark grey engine exterior and the electric blue interior?

Couldn't you just have a stab at the colour. Then paint all the engines on the model so they match.

Yes, I was just looking for an easy way out. I figured someone has painted some engines a matching blue and someone has painted something the dark grey that matches what FFG uses. I could whip up a custom batch myself, it wouldn't be the first time. But if there was something already out there it would be less hassle.

German grey from Vallejo is the closest match