New Pioneer camshaft retainer plate.  This plate bolts to the block, and holds the cam from moving forward, also routes the oil from the LH lifter gallery to the RH gallery.  Includes seal as shown. This is the 2nd design (current) cam retainer plate, which uses the beveled underhead bolts.  Bolts are not included (view listing #382226723970 for complete set).  Fits all LS based blocks, LS1-LS7, EXCEPT aftermarket blocks.   Fits the following:

98-02 LS1 V8 Camaro & Firebird/Trans Am
04-06 LS1/LS2 GTO
04-07 LS2/LS6 CTS-V
97-13 LS1/LS6/LS2/LS3/LS6/LS7 Corvette