1994 cutlass supreme Brake Booster replacement

[AjMillerKing]

My father owns a 94 cutlass supreme convertible and its brake booster has failed. Everywhere i look for steps to replace the booster mentions 4 bolts holding the booster from inside the firewall, however, when I go to look, no bolts are to be found. When I look at the new booster, it seems to lock into place using grooves and some kind of locking bar.

Nothing I do really does anything to get this booster to move and I am stumped on how to progress. The coter pin is out and the pedal disconnected. The master cylinder and abs contraption is off and out of the way. Theoretically, it should pop right out, yet it holds firm.

Any help would be greatly appreciated! Thank you in advance.

[Raffaelli]

The booster is held on with a 1/4 turn lock. 

 Make sure the locking tab isn’t holding it from rotating, (push/pull it into unlocked position.) then get a prybar on the master cylinder studs and rotate it off. 
 

 It’s so simple it’s stupid. Just an odd ball design.

[AjMillerKing]

Getting a pry bar on the studs is next to impossible, given the space you're working with. The service manual for the car calls for a specialty tool literally no one sells. You have to make it yourself. Hope you know how to weld. And grooves to lock it in place? Bolts not work for the engineer? Did narrow wrenches and short sockets not exist in the 90's? The idiocracy of the design choices in the W-Body is astounding! Honda out there making cheap, easy to work on commuters in the 90's while GM was living in their own little city of dreams. Hollow, dim-headed loonies, the lot of them were.

[Raffaelli]

I think I watched a guy on YouTube do one, and he used a claw hammer.