If I remember correctly, there is a inner rubber seal on the caliper piston and the outer rubber seal that you can see. That's all in the kit.
Clean the piston and inner part with a FINE scotchbrite and brake fluid. You are just going to clean the gunk off. Sometimes the piston goes back in with the new seals easy, sometimes it wants to be a hassel.
But, you can do it easy enough.
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