A single caliper set of OE equivalent pistons and seals for a rear 2 pot Brembo STI caliper for Impreza WRX STI 2001-2018.
Comes with all items shown in the image, which includes 2 pistons and associated seals and rings and bleed screw. Covers one rear caliper.
2001-2018 Subaru Impreza WRX STI Rear 2 Pot Brembo Caliper
Should be installed by a qualified vehicle technician