Must be generic, I see this one it should work I'm thinking...
Plunger for Kickback, Knocker, Auto Ball-Launcher: $11.95 ea
Part # A-6306-2
Standard metal ball plunger with nylon tip for use in kickback lanes, ball-launch (shooter) lanes on games with auto-plunger, replay knocker assemblies, and some other playfield devices. For use in most makes/models. This plunger measures 3-7/16 inches (87mm) overall length. Nylon tip protrudes 1/4 inch (6mm) from metal plunger. Use with coil spring # 266-5020-00 (below).
Can be used in auto ball-launch mechanisms on such games as Medieval Madness, Attack From Mars, Lethal Weapon 3, Guns 'n Roses, Terminator 2 and many others.
Replaces Data East/Sega/Stern part #'s 515-5000-00, 515-5000-01, 515-5000-02, 500-5080-00, 500-5081-00, 500-5477-00 and possible others. Replaces Bally/Williams # A-6306-2, Bally # A-550-4, and similar units.