Early -6s had floor mounted rudder pedals. Later -6s had "overhead" mounted pedals. On the overhead version, the pedal support bars slid into high density nylon blocks that were through bolted to the fuselage longerons on both the left and right side. Each nylon block requires two bolts. There is an additional "mid-span" nylon block that supports the rudder weldment bars. Within a narrow range, all three nylon blocks can be unbolted and moved to a different location, and new mounting holes drilled into the longerons and the center support structure.
The rudder pedals attach to the rudder cables via sets of steel links. These steel links may need to be modified to accommodate your repositioned rudder bar weldments.
What ever you do, be sure to check for full rudder travel and that the rudder does contact the rudder stops.