http://www.preferredbuickgmc.com/ (616) 604-4260 Riding on a 119-inch wheelbase, the production Enclave appears virtually identical to the concept car shown at the 2006 North American International Auto Show in January. Like the concept, the crossover sports signature Buick cues include a waterfall grille -- with "tri-shield" emblem -- and portholes. The portholes, which are similar in design to the new Lucerne sedan, are mounted on the trailing edges of the hood, which forms a distinct "V" shape.