Hi 'Airsporter Ist', sadly I do not have the sight that you seek. However, it was that exact item that started me collecting air-rifles. I had returned to UK after eight years overseas and, nostalgically, I bought a nearly new airsporter at an estate sale. I could not place why it was so different to the memories of the MKI rifle I had sold when departing UK years earlier. After reading Hiller (or it might have been in one of his newsletters), I discovered to my horror, that the sight was made from some plastic muck named 'Kenmetal'. When I removed it, I could see that although it visually resembled metal, it was in fact closer to cheese in its consistency. After that, I began collecting 'all steel' classic underlevers. Good luck with your search, perhaps another BSA model metallic sight might fit? MarcDV