100 Dash 111 Buna-N O-Rings.  Dash 111 are typically the right size for many cornelius style homebrew keg posts.  See: Bulk Keg Orings and Keg Repair Part Numbers for more information.

Important Note: Although these are the right size for ball lock posts (not pin lock posts), they aren’t necessarily appropriate for use with homebrew kegs.  As of this update they are not marked as appropriate for food use.  If you’re looking for food grade, o-rings, which I think you should be consider: Ball Lock Post O-Rings – Pin Lock Post-O-rings – Complete Lineup

111 Buna-N O-Ring, 70A Durometer, Black, 7/16″ ID, 5/8″ OD, 3/32″ Width (Pack of 100) – note that multiple variations of this product may be available, as such a different version may appear at this link

Also: Kegerator Tips & Gear | Keg Repair Part #s | Recent Keg Finds

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Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions.

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