Hello Roger,
the mast was from Isomat, which have been acquired few years ago by SparCraft, a french company.
www.sparcraft.com/
You can join them on: +33 5 4645 9045 or by mail: contact@sparcraft.com
The mast model, at least on my Feeling 1090, was a Isomat Ocean Range NG51.
If it is your mast as well, the reference for the complete gooseneck is: 3451177OC25 (to be double checked with SparCraft of course).
Good luck for the ordering, and let me know how it goes.