nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqfvtg7ullfle9yfjlte60l6fz3afx88n9aptk78my9g8d4xrj6naq2xkjdt (nprofile…kjdt) Could it be 16525 instead of 16S25?
I think your best bet at this point is to locate some 1991-2 era STM parts catalogs and see if you can find the part there.