I think the pins are really 5/16". Measure the slots on the side of the shifter, that's the size pins you want. The holes in the shift tower that they fit may be 1/4".
Early on I drilled mine out and put roll pins (spring pins) in, it worked OK, however, if I were to do it again I would duplicate the original setup with stepped pins installed from the inside and riveted/peened over on the outside.
Just remove the old ones, make the new ones, and install, no modifying or damage is done by duplicating the original setup.
Grigg
