The gas struts are pretty easy to find.
Do a google
search: gas strut + stainless steel
For example, just in Brisbane
there are 10 suppliers also with local manufacturers who will make to your specification.
For Boardshorts: Craig, suggest you try Gas Struts Sales and Service
, unit 2, 1029 Manly Road Tingalpa (not far from the marina in the same complex as BIAS chandlery).
As for the lockers, send an e-mail to your local Lagoon
dealer. Otherwise you might find a part number embossed somewhere on the item.