Need Help. Brake Booster on 67 barracuda

I think I've got the same Midland Ross booster (about 7 or 8 inches in diameter). I just sent mine off to Power Brake Booster Exchange (aka "Booster Dewey" - http://www.boosterdeweyexchange.com in Portland Oregon. I bought mine used and have no idea of the condition so it's off for repairs as needed and to have the anodizing done. This might work for you.