1962 single to dual master cylinder

[62_C10]

I'm currently running a single master cylinder in my 62 short/step and want to convert to dual, staying with manual brakes. My question is what do I do about the line going to the clutch? Do I buy a single mc just for the clutch? Also, is there a dual mc I can buy that will bolt right up directly to the factory holes on the firewall left by the stock single mc? I am new to this site and any help would be appreciated. Thanks!