This Shaft Seal is used on a Number Of Pumps. The Impeller On The Stealth Was Originally Made With A Different Shaft. Revisions N And Lower Had an Impeller With A Double Stepped Shaft. These Older Revisions Require a Shaft Seal With A 13/16" Inside Diameter On The Ceramic Portion. Revisions P and Higher Have No Step Where the Impeller Goes on the Motor Shaft. These Newer Revisions Require a Shaft Seal With a 5/8" Inside Diameter on the Ceramic. The R0445500 Originally Came With Both Shaft Seals. As Of Mid 2012, Only The Shaft Seal For The Older Revisions (13/16" ID) Is Included. Shaft Seal, #A0580500, With A 13/16" ID is the only seal that is included. The image shows both seals for illustrative purposes, only 1 seal is in this kit. The Correct Part Number for the 5/8" ID Shaft Seal is R0479400