I actually ordered a Ventura rack back in April of this year, and the US Distributor said it was backordered at the time. I eventually cancelled my order, but the lady at the US distributor said that they were definitely expecting one rack for the TT600/Speed Four in with their next shipment, which according to her should be here by now. That means there should be one set waiting in Washington right now for one lucky American TT/S4 owner. Visit:
http://www.cycleventure.com/
That is the Web site of the North American distributor for Ventura. You can order direct from them.
-KeithU