I looked in the World Registry (available for purchase at
www.saac.com 
) and Bert's 289 is an FIA. It was displayed as CSX7006 at the Monterey Historics 8/99.
According to the registry there were only 15 289 Street KMP's with leaf spring chassis. All other 289 production were some form of the FIA body. They're all over the place: FL, Germany, England, CA, MI, UT, etc.