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It's a long shot but give Nubrite in Vancouver BC a try. They repaired some Maya's for me I and was happy with the serivce. They have worked on lots of Maya's in the past so they may have a lead on hardware.
they're nuts and bolts. just make sure to use the right size and suitable hardness. when i was looking for metric stainless hardware for my lowenharts i ended up going with these guys: