Early KTM front Master Cylinder Vintage

Hey Guys,

I posted this in the Vintage groupl but no answers yet.

I have a front end off of an early KTM 125 with the 4054 upside down forks and the early front disk set-up. I have the forks and wheel and caliper, but don't have a master cylinder for it. I would like to use one of the newer MX type MC and lever assemblys, but I don't know what size piston this early disk set-up came with. Was it a 1/2"?, 12mm?. 5/8" or what? I want to match the piston size so that I get a good lever feel from it. It has the early 4-piston caliper.

Thanks,

Swiss

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