Ok so I know this may sound weird to some of you, but my truck didn't have power brakes and while converting to the 5.3 I was given the master cylinder and booster for the brakes off the 2002 silverado donna vehicle. One of my brake lines on my 81 fit the 2002 booster the the other was way to big. Does anyone know the fitting size for the brake master cylinder of a 2002 silverado so I can get a new fitting and reflare the line? Thanks for the help.