correct levers 1953/4 b33 plunger

[luap]

I have a 1953/4 bsa b33 i believe it should have hi/low switch on the back of the clutch leaver bracket
is this right?
if so what is the make are these ?
I have two right hand ones and 3 levers that fit but the bit near the nipple is 1/8" longer than the bracket and the lever is two fare from the handle bar to get a good  grip
(they poke out at 45 degrees )
any info would be great thanks paul