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J-41479-4 is used with existing J-41479-4 Screws from J-41479-A Seal Installer and J-41479-2B Seal Installer Pilot to Retain the Pilot when servicing the Rear Crank Shaft Seal. The LS9 uses 9 Retaining Bolts for the Flywheel, and should be Retained in three locations to ensure J-41479-2B is seated properly. Adding J-41479-2B and J-41479-4 to J-41479-A will update it to J-41479-B Rear Seal Installer.