Drum Brake Wheel Cylinder Size

[Weldguy]

What are the proper wheel cylinder sizes (bore), front and rear, for 1970 Challenger R/T with 11 inch drum brakes all around?
As always... thanks for your help.

 

[Xcudame]

Front: 1.1875" (1 3/16")
Rear: .9375" (15/16" )

For more info, see below.

 

[moparleo]

The information is also found in your Factory Service Manual. Everyone should have one.
Free downloads are available.