Neat gun, Bob.
The OMS is a 'sleeper' for sure, and a great target-puncher!
The 'Coltwood' plastic panels that probably came on the gun are (IMHO) too small and hard to handle.
Plus, they're expensive.
May I suggest a set of Patrick Grashorn ('Executioner') stags made for your gun?
Very reasonable, he'll make them a tad thicker for good target-shooting, and they look great.
Below is a shot of an OMS I had that Patrick made grips for.
Don