We used R47's as replacements until almost 2000. I don't remember when Sylvania stopped making the R47. I know a small stretch with OVX's that are from when the OVX was just starting to be used here. I miss the days before the OVX took over here. They only use the OVX with the new lens here now. For some reason Brampton really never had many OV-25's. Missisauga and Toronto were bountiful