I ran into the same problem as many other people in trying to find the 12mm fitting for a 1" master cylinder. After scouring the internet for weeks it seems my grandfather (who races British Vintage touring cars.) turned me on to a race shop near his home town, and voila here are the fittings. So what follows is there website. The -3an part number is 3265-45

http://www.pegasusautoracing.com/adv...yID=BRAKEADAPT

 

I was pissed when I ordered a 12MM banjo which is almost unheard of as the norm is 10MM. I paid a **** ton for it and ended up finding them for $6 a piece at a small local hose maker business. I bought a spare just for precautionary measures lol.