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I believe that with the new salt and pepper shakers, the salt shaker is the one with 3 holes, while the pepper goes in the one with 2 holes. Salt is used more than pepper anyway. Pepper should only ever be fresh ground at the table, meaning salt shakers win out.
These units also offer a through-hole armature that includes a chuck and collet attachment, providing simple stinger setup if used for modal applications. The 2004E and 2007E miniature shakers, as well as the SmartShaker TM, offer a 10-32 threaded mounting surface which allows for stinger or test article attachment.