I think the grips on it now are rubber Nills. Kinda big on the three-inch bbl. version, but should help you to shoot well.
Probably no US-made grips. Ask Manurhin about round butt originals. Address the Export Director. He should speak English.

The Commercial Counselor at the French Embassy should have their address and phone number.

Expect a high price, plus shipping, of course. But you may get lucky.