Hi;
How Big are they? You will find that the Smaller Binocs are a unusual thing. There was back in my ChildHood(yeah,I had one of those too) Small Binoculars called (Opera Glasses). These were used in the V.I.P. Boxes to allow the (Uppercrust) To see the stage and performers Better.
They were by definition Smaller specific use ("Extendable Glasses") For far viewing in an enclosed area. This may be what you got. The Larger Binoculars were used by the Navy and Army units for Surveillance Specifically. Then Hunters used and still use them to this day.
What you can do. You can cut off the connectors, between Barrels rightat the barrels.Then take .080 Sheet and using the original part( stillattached) as a pattern, just elongate the part that connects to the Barrel. Or save your money and Buy your own that fits the width of your eyes!