Ford Model K Roadster, a luxury sports car manufactured between 1906 and 1908.

AI Says its something else (see further below), but I believe it to be the 1st Option, a Ford Model K Roadster Rather than a Buick Roadster 

Ford Model K Roadster (1906–1908)

The Model K was a significant departure from Henry Ford's goal of producing affordable cars for the masses. It was a high-end luxury vehicle powered by Ford's first six-cylinder engine, which produced 40 horsepower and allowed the car to reach speeds of 50–60 MPH  

Ford Model K Roadster was a rare luxury six-cylinder model that preceded the more famous Model T

Design: This specific roadster version featured a 114-inch wheelbase and sometimes included an unusual "mother-in-law" third seat behind the front seats.

Market Position: Aimed at the American sports car market, it cost between $2,500 and $3,000—a price comparable to a nice house at the time.

Legacy: Due to its high price and technical issues—such as a transmission that struggled to handle the engine's power—only about 900 units were produced. Its perceived failure led Henry Ford to return to his primary mission: mass-producing affordable cars like the revolutionary Model T, introduced in 190




1908 Buick Model 10 Roadster Ethun Race Car 1960s Press Photo 10x8in White Streak

1909–1910 Buick Model 10 Roadster, customized as an early race car. Known historically as "The White Streak" or "The White Flash" due to its signature factory white paint and frequent victories, the Model 10 was Buick's most popular early vehicle and significantly outsold contemporary rivals.

Key Technical Specifications

Engine: 165 cubic inch (2.7L) inline 4-cylinder engine with a pioneering overhead-valve (valve-in-head) design.Power

Output: Developed approximately 22.5 horsepower.

Transmission: 2-speed planetary gearbox controlled by foot pedals and a side lever.

Top Speed: Approximately 40 mph in standard factory trim, though modified racing variants achieved higher speeds

Historical & Structural Details

Body Style: Lightweight roadster configured for two or three passengers, often fitted with an open rumble seat.

Racing Modifications: This specific vehicle features a stripped-down chassis, removed fenders, specialized vintage headlights, and a "Sports Car Races" plaque with racing number 25 attached to the front frame.

Legacy: The lightweight construction, paired with its advanced OHV engine layout, made the Model 10 highly agile and a dominant force in early Brass Era American motorsports