If you are a good parts scrounger, this caliper bracket seems reasonable to me. THIS AUCTION is over but I'm sure you can contact him for the parts.
"Low buck" and " '55,'56 or '57 T-bird" are not words that occur naturally in a sentence in any known Earth languages- therefore the premise for your question is doubtful-
Granada spindles and brakes with a proportioning valve. It'll even lower it a couple of inches. It's a bolt in on the sedans.