Greg, this is one of the easiest things, really. The brake lines are all available, search "GHP71" and you will see the exact same hoses used on Morgan, maserati, etc... https://pantera.infopop.cc/top...36#19059944242017936
All 4 lines on the Goose are the same thing. And lucky, you still have the brass banjo fittings for the rears-- but Wilkinson also has these.
https://www.ebay.com/itm/25499...tkp%3ABk9SR5b18JHMYw
Then, for hard lines and fittings for the british fittings, FedHill is great. http://www.fedhillusa.com/
Seeing another goose in Iowa is as unlikely as seeing a sailfish there