i installed the new master cylinder on the vacuum booster. i used the old rubber boot that goes between the m/c and booster. that is when i noticed that the o.d. of the new master cylinder part that goes into the booster, is smaller than the old one looks similar to the original photos in this thread (atleast now though, it has the correct looking center pin). will this be a problem ? i'm thinking now my problem will be the vacuum won't seal correctly ....... i knew this seemed too easy but now its really turning into a pain.....