Like new Walker model 81143 seen in pic is listed as a direct fit for a Honda Accord but was modified to be a universal fit by a professional Muffler Shop and is essentially now an 81101. The 81143 and 81101 are the same cat just one is direct fit and one is universal so this is basically a universal that can be welded to your exhaust. It was modified and installed and then removed from the vehicle when it was discovered I needed a different CAT. It is essentially brand new.
So if will work if you need a 81101 Walker cat for you vehicle. Check the CARB website for a long list of vehicles that this fits. Generally it fits older vehicles 1980 to 1995 such as Hondas, Infiniti, Acura, VW, Audi, some older BMW...etc etc...
This link shows that the two models are the same cat:
https://ssl.arb.ca.gov/AftermarketParts/catalysts
Below is the CARB Executive order with the extensive list of all vehicles this works with.
https://ssl.arb.ca.gov/AftermarketParts/Catalysts/ExecutiveOrder