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Hello,
First, the reason that Navtec changed those tangs is that the old head shape was too fatigue-vulnerable. So your rod likely has a tenuous attachment to your mast; time to do something.
Changing to wire has costs, too. Normal tangs aren't so spendy, but if you want to keep the turnbuckles at the lower ends, you'll need to have very expensive Navtec turnbuckle bodies swaged on the wire. In my experience, these cost more than a conventional turnbuckle plus a wire terminal. On the other hand, Navtec turnbuckles of that age might also need replacing anyway.
Possibly you could simply put conventional tangs in, and get eye fittings, same size as for wire, on the upper ends of the rod. It all depends on being able to fit the tangs to existing holes. Be careful here, as there are likely backing plates to deal with, as well as that big hole. Got pictures? If you need to replace turnbuckles, get conventional ones. These boats are peppy enough to notice the difference between rod and wire, so I'd do what I could to stay with rod.
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