Thanks for the replies.
No luck on Addco. They don't list anything for the Fit:
http://www.addco.net/Honda-Jensen_He...bars.htm#Honda
Found this on the T!R B-Max kit. It includes nothing about swaybar adjustment (but it looks sweet otherwise!):
A&J Racing :: Suspension & Brakes :: Fit/Jazz (GD3/4) :: T1R B-max 52 Damper - Honda Fit 07-up GD3
But I did find this from an ad in Grassroots Motorsports magazine:
Powergrid, Inc.
They offer adjustable swaybar endlinks for the Fit. These don't allow you to adjust swaybar stiffness, but they do allow you to dial out preload on one side -- or to create preload on one side if you want that. This looks like the best thing out there at the moment.
Anybody used this kit?