I have an FL-20 flash with the PFL-01 underwater housing. Both in great condition. This would work with any Olympus Camera with a hotshoe. If you have the SP350 this little flash will also extend your battery life. The other advantage is the FL20 can also be used topside.
I'm asking $100 US dollars.
I also have an athena bracket that holds fiber optic connections for the PT-E03 Olympus underwater housing. Photos attached.
Asking $50 for the Athena Bracket