So today I started changing out the defective booster. Had enough time to pull the master cylinder, and here's what I found. Based on the FSM illustrations, the filter housing was installed upside down on the booster. Who ever installed the master cylinder simply shoved the retaining screw assembly into the filter and tightened things down. This is what I found... ^^^ Am I 'F'd"???? The master cylinder shaft popped out with the cylinder but for now it's pushed into the booster. I have access to a Kelsey Hays type booster NIB but missing the "air filter" gasket according to the FSM Will the KH booster exchange with the MR here? Or is the brake pedal position different? Can I use or locate the gasket used on the Kelsey Hays? So many questions, meanwhile, I'm preparing to do a dual master cylinder change over and fix my steering coupler install.