I don't see why the bracket won't work. Then you can do your own research on what bore size MC you need for your brake system. It is a system, all the (original) parts were designed and need to work together. To replace one part, and the MC is an important one, you need to still be sure the system will function correctly.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-