Brake shoe size

Oops, sorry, my bad.
Your looking for FRONT brake parts.

Look up 76 A body cars, as they had a police car package, with the 10 X 2 1/2 inch rear brakes.

Valiant pursuit cars with V8s used a wide 70 series police radial (with two plies of fabric cord and four full-width textile cord belts under the tread). The calibrated speedometer ran up to 120 mph rather than the usual 100 mph, while the power steering had a (desirable) firm-feel chuck and an oil cooler. The radiator was larger (22" with slant six, 26" with V8); heavy-duty brakes included front power discs with metallic linings and rear 10 x 2.5 inch drums with automatic adjusters. Interior trim was vinyl, in gold, green, or black, with heavy duty front cushion springs and air foam cushioning, and a full foam front seat-back.