Fits Mercruiser stern drives. Non Greasable 

47-21001:Replaces: 30-60794A2, 30-60794A4, 30-879194A02 Non Greasable Fits: MC-1, R, MR and Alpha(1974-97), Gen II(1991-97), Bravo I/II/III (1988-95)

47-21006: Replaces: 30-862540T1, 30-862540A3, 30-862540A04, 30-879194A01 Fits: Gen II (1998-10), Bravo I/II/III & X/XR/XZ (1996-10)