The Inner 2way Tray-J1, Inner Finisher-H1, Staple Finisher-Y1 or Booklet Finisher-Y1 cannot be installed at the same time. Requires Buffer Pass Unit-L1. Booklet Finisher: Includes 1 staple cartridge for stapling (5,000 staples) and 2 staple cartridges for booklet (2,000 x 2 staples).NOT include additional staple cartridges.