The MV12W recreplamcent part kits is MA-MNT-MV-61. However, that appears to have gone end of sale now. But resellers might still have some if you search around.
As for newer camera models the MV13 would be the gen 3 successor to the gen 2 MV12.
Also, not sure what damage you've experienced on the MV12. But, if these are going into a gym you may want to consider more rugged models like the MV63/73/93. They would be more resistant to things that could happen in a gym.
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