Just finished and installed it today. and yes i cut the old tubes that were in the original bushings,
i also had to use thin washers on the bolts inside the u brackets so the bracket would not bind up the outside of the bearing.
The shifter feels great,like its its part of the gear box like a mustang or 240
also added about 1/2-3/4 of a inch to the bottom on shifter , Its now about 3.5 inches between each gear!