If you currently have a larger size piston in your vehicle, you would need to replace BOTH wheel cylinders.
Wheel Cylinder Rear 19.05mm Fits Volkswagen Type1 Bug 1958-1964 Ghia 1958-1964
Emergency Brake Cable 1742mm Fits Volkswagen Type1 Bug 1958-1964 Ghia 1958-1965
1958-1964 Chevrolet impala manual center drag link and pitman arm assembly
1958-1964 Chevrolet chrome power brake booster master cylinder disc drum valve
REAR WHEEL CYLINDERS SET OF 2 LEFT & RIGHT PAIR VOLKSWAGEN T1 BUG GHIA 1958-1964
Empi 98-6095 Brake Shoe Set Vw Type 1 Bug, Ghia 1958-1964 Rear