Charlie, I bought carbine scabbard straps from Hayes Otoupalik around the middle 1990's for about $40, They look too new but I kept them and thought
that if I sell the leather scabbard at some point the straps can go with it. The Otoupalik straps are repro with brass hooks.

Now I understand the really rare leather scabbards are the Model 1903 scabbards converted to use the M1icon rifle before WW2