Thanx. I checked the Sport Rack website and found a model, identified as a "Mondial 6-AO2306," for a '98 Sidekick 4dr. I assume that is what you bought. If not, I'll find a '96-'98 trackkick and measure. From other threads, I get the impression that the Sport body might be wider than the Canadian built trackkicks, tho no one has shown any numbers. From what I saw on the website last nite, it appears that the rack length is not easily adjustable, as on the Yakima and Thule.
A note on the website said that rack is available only in Canada. Suppose that company doesn't like US $? I found at least one company on the web that sells it, though.