Does this mean you already converted the P-51 from electric to glow?

If not, and your intent is to convert the other aircraft to glow, there are a few things you might also consider before doing so. The electrics were made lighter than their glow counterparts, meaning more fragile. They may may tend to be less able to deal with vibration than the electrics they were designed for.

Be careful with this conversion. I would do as the previous poster has recommended, but you may want to fuel-proof (which is NOT done with electrics because there is no liquid fuel consumed and the oil byproduct on the wings and everywhere else for that matter) and strengthend with epoxy in other places.

CGr.