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Yeah, as lewtot184 says...
Because you already have the Discs on the car.
It's not like you are going from Drum to disc
Your going from Disc to power-assisted Disc
So, you need the Power booster and might as well go to the Dual cylinder although the single worked for many years before it was determined to be a "single point" failure capability...
Just my 2 cents...(I'm going dual on my Max Wedge style 63' Polara)