This is One pair set of   brand new GM complete

rear wheel cylinders

for 1965 to 70 Full Size rear drum brake.

Same cylinder works on either side.

FYI they are 1 inch bore with 3/8 pipe in.

Suitable for Impala, Belair, Parisienne & Laurentian.

• Two needed per car. . this is a pair.. Never change just one cylinder unless you did the other recently.. Equal hydraulic pressure will always seek out the weakest older seal..  and if you don't change both.... .I'll get the wife to ring you up and lecture & nag you...!