[cruzingratiot]

Cardone 54-71325 power brake booster ( Catalina brake booster ) will work on the Grand Prix
it looks a little different bolts right up

pictures attached
has coarse thread 3/8-16 bolts through firewall and to hold on master cylinder (new nuts supplied )
instead of 3/8-24 fine thread

my car is no 100 point correct car it is a driver
and I was quoted with shipping 230 to 250 to rebuild mine through cardone and others
with a 2 1/2 to 4 to5 week turn around
the Cardone 54-71325 was 100 shipped to my door ( no return core needed )

the master cylinder which dosent have the screw top
was a generic from inline tube
60-66 GM Drum Brake Single Master Cylinder 1" Bore

the pin that pushes the master cylinder just needed to be screwed out a couple of turns
I never bought a booster that didn't need a little adjustment on that screw

I am keeping the old parts
may be I will win the lottery ..and have them rebuilt one day
or the next owner can

and there is no difference in brake pedal feel to me

Paul