A-body 8.75 rear axle shafts with 5x4.5 bolt pattern

I will put the 1973-76 front Disk brake factory set up on my 1967 Barracuda. Want to buy and use tubular UCAs, reinforced LCAs, and custom small bolt pattern disks instead of factory OR large bolt pattern 8.75 rear axle shafts. Want to buy the prop valve and brake master with or without booster - what do you recommend? I live in Southern California.
Doctor Diff offers 5x4.5" axles for the stock A body 8.75 housing.
The bigger axles require use of B, C, E body (among others, do a search) brakes due to the 5x4.5 shafts having a different flange offset from standard A body units.
Mopar Axle Package 5 X 4 1/2" (5 X 4.5) Bolt Pattern 30/35 Spline