Centauro engine paint

I have recently purchased a Moto Guzzi Centauro of which I’m in the process of restoring back to its original condition.
Unfortunately the previous owner has resprayed the entire engine black which is peeling off badly.
Does anyone know where I could find the original engine colour paint or the paint codes for it. Looking at pictures it appears to be a light grey that was used on all the Centauro and Daytona models at the time.