The one you have shown is for a Rapier which has a blade length of 40 inches plus. The 1767 french sword is an Epee and only has a 32-inch blade so my though is that one would be larger than needed.I don’t know if this would work, but here is something I googled.
Do you have any contact info? even though I'm not left-handed he might be able to make me one. This sword will be worn mostly as a gentleman's dress sidearm.G. Gedny Godwin had one for my french short sword, and had the hanger custom made for me due to my being left handed. Nice folks.