BSA Oil tank filler cap

The catalog record shows it appearing alongside sidecover and silencer listings for that model year, but doesn't spell out a specific machine name beyond the manufacturer tag. If you're trying to match this to a particular bike, it's worth double-checking against what's currently on your oil tank before ordering, since cap threads and tank necks aren't universal across the range.

Other catalog listings for this same part number describe it as a chrome cap on a TR25W, which lines up with the general idea of a filler cap finished for visibility on top of the tank, though we'd rather you confirm fitment with us than guess from that alone.