new owner 2002 GO 140 board and sail/boom-need mast help

[lkw]

Hello - I'm a newbie to ownership of this equipment, have stepped on a rental a few times though and wanted my own gear. I have picked up items in an odd order perhaps - I have a 4.7 Aerotech sail, a new Chinook adjustable boom, and just found and purchased ( but not yet taken delivery of ) a 2002 Starboard GO 140 liter board. She has a fin ... but no mast.
I cant find in the online literature or see in the photos of the board what type of fitting will be required to attach a mast to the board. Can someone describe what style / type of fittings or base etc I need to find to finish this cobbled together starter outfit ? ... many thanks