Could someone please help me? I've purchased an old 'Monarch Deli grinder' and the burrs need replacement.

They are left hand, 85mm external & 63ish mm internal diameter but the difficulty appears to be the attachment screws. There are 4 of them. Can I get a 2 attachment screw burr in this size?

Very frustrated as I have been misiinformed by the vendor about this machine in general

Suggestions gratefully received.