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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.
Make sure to leave an area on both sides for the 1 inch axle hole and clean out all the plastic shavings with a razor knife. If you are using a food grade pickle barrel like the one Dixie Grilling used in his plans below you can also drill the 1 inch axle hole at 21-1/2 inches as shown in the plans.