cb_martial_arts_spar_cagev2.tb is the one I think you are looking for, or one that could be use as a mas mod,
You can also look for lawz_mas_ring_4_5_15.tbm
both are cage like mods for mas,
Sorry but I don't have links, But you can simply google the creators and or mod names followed by toribash, (yes it is that simple).
Or I can post them here if i can find them.