'63 m/c to '72 m/c actuator rod question.

Converting from '63 single / fruit jar master cylinder to '71-'73 dual master cylinder.
( Scarebird disc conversion)
Question is.... What actuator rod should l use ?

One from the '63 m/c. ?
One from a '71 m/c ?
Or make one?
I am a race team welder / fabricator and was thinking of just making one up with a Hemi joint like on the race cars.

Your thoughts ?
( and believe me. They are greatly appreciated and considered).
Racing's crew chief's didn't get where they are without listening to others who came before them.