Send an e-mail to The Hostel Shoppe
http://www.hostelshoppe.com/recumbent_catalog.php.
They deal in a lot of parts for a lot of companies, but even better....If I have this correctly Rolf Garthus, the owner, actually took over Vision and morphed it into Volae back in 2003.
I own a 2005 Volae and it's a great bike. The folks at the Hostel Shoppe can talk with you about parts availability for Vision and explain their International shipping policies.