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Roger Hulett

I too am in need of pipe fittings but before I order would you clarify the size needed. The oil tap that fits into the tank on my 1927 bike is similar to Part No 721 (taper swivel ) on Armours online catalogue. The descriptions on Vintage Supplies taps have the thread sizes the same on each end. On my tap the thread that goes into the tank is 9.75mm outside thread with approx 28 tpi (probably 1/8 bsp. The outlet end,for which I require a nut and nipple ( 1/4in pipe ) is 11mm outside thread with approx 20 tpi. So,what thread size is that ??
( 3/8) ???
Help will be appreciated
Roger Hulett