IMO, about he only way to go about it would be to find a complete donor or a take-off setup say on EvilBay.

Have the booster rebuilt along with the MC. If you are dead serious on numbers correct, the install has to come from an original (unmolested) 1955 as the booster itself has an updated 1956 PN and I would assume you want 1955 ID NOS.

I will look around for you in the meantime.

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Yes I would like to get an original booster to use

Are you wanting to use the original MIDLAND booster for appearance/restoration?

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Can some quickly explain to me how an original power brake booster works with the master cylinder . Do you have to buy a special cylinder for the booster . I am considering put power brakes on my Crown Vic. Just wanted to know if it was a lot of work assuming I can find a booster that works. I have many questions . Thanks for any answers.