I’m not sure it has been identified.
Most (all) people work with the wireframe worked out from a picture of the mast section (see reminder below):
@Manufoil extracted his dxf:
'Anyone used a Gong wing with a slingshot mast? - #9 by Manufoil
see @nice2cu here below , or @Manu who has designed a GONG mast clamp and released the STL:
'Database for mast & plate - #6 by nice2cu
As a reminder from here