I dont think the Legends are early enough for that. I would guess the airboxes changed in 97 for the 98 introduction of the TBSEarly airboxes did not have the locating tab on the front for the "cheese graters", later ones did. That is true of Thunderbirds, I'm not sure about Legends. Maybe some-one will clarify.
All the airboxes are interchangeable. Worse case scenario, you might have to switch to a later airbox with the locating tabs.