Late Roman buckle parallels - French help needed

[Agraes]

It's the buckle from the Vermand treasure. It was likely the burial of a germanic leader from the early 5th century, with a high rank in the roman army given the quality of his equipment. It was unfortunately robbed in ancient times.

Spear and belt fittings are on exhibit at the Metropolitan museum in New York :
http://www.metmuseum.org/toah/works-of-a...2.143-.146

There are also a shield boss and grip from the burial:
http://www.metmuseum.org/collections/sea...ions/22635

Edit:
After verification it looks like it's not the same buckle.