The stock style bushing can be used, once. It should not be reused if the assembly has to come apart. I would still use some sort of mechanical stop on the pedal. And verify the assembly of the pushrod to brake pedal hardware.
I pulled the rod out of the master a couple of times when
they were new.. was still a PITA but once they are older
you can forget that.. it shears the rubber off.. on my
set up I used a .120 OD push rod with the end welded on
and being smooth I couldnt use the stock type ring so I
added the perminate stop and never had any issue
