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Happily expanding the To Do list since 1997
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Sorry you've had this aggravation.

A replacement cat would come with bolt-on flanges front and back, but your photo seems to show the thieves have cut off those flanges, taking a few extra inches of pipe on either side. So your options seem to be either to get an exhaust place to weld on new pipe and flanges so they can bolt in a new standard sized cat, or to let them weld in a generic cat with plain pipe ends. The latter option is probably cheaper. You have a third option as your car is a grey import Japanese Eunos Roadster (according to your other thread) rather than a North American market Miata; you could just delete the cat entirely and have them weld in plain exhaust pipe. That's okay for any car up to J-reg which might include your 1992 model, but not for K-reg unless it has a specific exemption. Being a Eunos Roadster, yours will have that exemption.

If you chose to delete the cat be aware the car will be louder and the exhaust smellier. Happily, even the cheapest of aftermarket cats will be more than adequate as your car only needs to pass a non-Cat emissions test.

One other little detail is that Roadsters have a cat overheat warning lamp in the dash. It connects to a sensor in the side of the cat and your photo shows the broken end of the wire dangling down. (A replacement cat would not have the sensor to plug into unless you got a cat specifically for a Eunos Roadster which I guess would be prohibitively expensive.) Left like that the "Heat" lamp will be permanently lit in the instrument panel. If that bothers you I believe you can fix it by looping the pair of wires in the cable together. There's a plug under the car not far from the cat so you can unplug the short tail of cable. Then you can shorten it and separate out the pair of wires inside, join them and insulate the ends. That should make the Heat light go out.
 
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