The Brison 6.4 twins used the same reed setup, and maybe the D&B and Fox twins too...One of those companies should know....
The original reeds were metal...The Brison used the metal reeds, I think D&B had some made from fiberglass...
Just worked on two different Brison 6.4s, both had the same reeds, SDC 80 carbs, but different crank designs...