Abu Ambassadeur 3600/3600C Spool Spindle.
ABU part No 815801.
To fit models with reel foot number as follows:
Black Max 3600 - 02-00
Black Max 3600 - 02-01
BM 3600 C - 02-02
BTC 3600 C - 08-00
Please check your schematic to ensure this is the correct part for your reel.