Response to Hello Alvie.  The Sta-Rite Impeller C105-238PB is the direct replacement for the impeller identified in the photo provided.  The metal part that you reference is a part of the old shaft seal, underneath is a rubber ring, also a part of the old shaft seal.  These items are not a part of the impeller construction.  When replacing the impeller it is recommended that the motor shaft seal, seal plate O-ring, and diffuser O-ring be replaced at the same time.  The GOKIT38 contains the parts necessary to complete this project.   Tune Up Kit Sta-Rite P4E & P4EA Max-E-Glas II / DuraGlas II - GOKIT38

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