BBB remanufactured alternator. This is the older, standard pulley alternator (non-clutch design).  No core charges.  This has a 4-pin connector (not a 2-pin).  OE for the following:

97-01 LS1 Corvette

NOTE : For swap purposes, this mounts to all 97-09 LS1/LS2/LS6/LS3 Corvette OE alternator/PS pump brackets, but requires a 4-cavity connector.