These new seal kits are made from the correct Nitrile material for use in mineral oil cars.  Gallery seals are included.
These seals and boots are a completely new design and they actually fit.  If you've struggled with seal kits from other vendors, you know how difficult some of these seals are to install.  
These kits are priced per caliper.  You will need 2 kits for two rear calipers.