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