I think that's how Duesenburgs were sold, just a running chassis with cowl and grill, and all bodies were custom built.
Pulled from an article from
trustauto.com:
Duesenberg Model J
The Model J is arguably the best-known and most successful Duesenberg, as almost 500 units were produced. It was designed and developed by Fred Duesenberg three years after E.L. Cord acquired his company in 1925. At the time, Cord sought to take on luxury brands like Hispano-Suiza, Mercedes-Benz, and Ischotta Franchini. The Duesenberg acquisition, and Fred’s talent, would enable this effort.
Debuting in December 1928 at the New York Auto Show, the first Model J was a sweep-panel, dual-cowl phaeton finished in silver-black and featured a LeBaron-designed coach. Priced at $8500 ($137,000 today) for the bare chassis, a fully loaded Model J could hit north of $20,000 ($323,000 today).
Underneath its striking design was a potent straight-eight engine with four valves per cylinder and dual overhead cams. Offering up to 265 horsepower, the car could hit 119 mph. While not the most powerful or fastest car of its era, the Model J was the most expensive. It’s also helpful to remember that the Model J launch occurred a month after the 1928 stock crash and the beginning of the Great Depression.
Duesenberg Model J Variants
Along with the Model J, other variants, including the Model SJ, SSJ, JN, and SJN, were built between 1928-1937.
Customers could buy a Model J variant and have the coach completed by Duesenberg or constructed separately by an independent coachbuilder.
*I wish I knew more about the subject, but I've forgotten so much of the information since I sold off my Duesenberg collection years ago...