Kelvin:
I hear what Larry is saying about how to do it. He definitely is the one with the knowledge. I personally would opt for one of the complete manifolds for LP and keep your NG manifold intact in case you move again to someplace that has a NG hookup. I don't have the drill bits and I doubt I could find them locally since the big box hardware stores have killed off places where you could find the bits you need or pay to have them drilled elsewhere. By the time you add it all up, it isn't that far off from a complete setup and knowing that it will perform to specs without having to mess with things to get low temps. I'm very glad that someone else has the same valves. Just be careful when you remove the pin from the valve stem in the bonnet. Pretty small and will travel. One of mine did about 5 ft. horizontally once it hit the patio!