Abu Ambassadeur BM/SM 6600 Line Guide.
ABU part No 21997.
To fit models with reel foot number as follows:
SM 6600 CL - 04-00
SM 6600 CL - 04-01
SM 6600 CLW - 04-00
SM 6600 CLW - 05-00
BM 6600 CL - 04-00
Black Max 6600W - 03-00
Please check your schematic to ensure this is the correct part for your reel.