Gaz,
whether the donor had a cat, is not relevant as the search in the vehicle data base has to find an exact vehicle match. Haynes roadster isn't in the vehicle database as no emissions data has ever been filed for it and won't be unless it becomes a low volume product from a single manufacturer.
So as long as you can prove the engine was manufactured before 1995 that's all that counts.
HTH BV.
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