Which P51 ARF?
The plastic belly pan on the EZ line holds up really well. I had no problems with either of my mustangs. EZ makes the Dago Red and also the VooDoo. They are pricey though. The only other that I know of is the World Models Dago Red. It has a fiberglass fus but Is not as pretty as EZ's. It also may be a 60 size.