Brake pedal sits too low

I'm watching I to am replacing the mc on a 73 duster in the kit I have the rubber boot I know where that goes but there is a rubber washer 1/4 'wide, does that go into the groove at the end of the push rod that goes into the mc did not take this out so I thought it should slide into the groove then into the mc let me know if that is right sorry not to high jack the conversion but great timing
To get the pushrod out, with pedal connected, remove the four nuts honding the MC on. pull the MC out and **** it so the bolts are under the MC, MC will be away from the body the length of the bolts. Then go in the car, and pull up on the brake pedal, pull hard and the rod will come out. Then use the new rubber part you got in the MC box. The 1/4 inch one.