Brake Caliper Piston Install ? ( Which way )

Have one ( FSM ) but always value any Solid input you guys have given me !

FINALLY got the front brakes bled! Put everything together and reversed the caliper pistons as they should be. Used the Mityvac which helped immensely. Can't believe how much effort this took. Never in my life has front brakes given me such a problem. New Master Cylinder works good and think it was decent quality. Only issue I have is a slight amount of brake fluid weep around the splitter. I ordered new sealing brake line washers with rubber seals from Dennis Kirk. Should do the trick. Came with the Master and really like how they seal. To everyone who offered advice to this Post, Thanks Again