The Fairfield County Concours d'Elegance -- the Westport classic auto show that benefits treatment of autism -- has launched a nationwide search for two special Jaguar E-Types.

Show organizers said they want to identify the privately owned E-Type with the lowest chasis serial number in the contiguous United States and the E-Type that has been owned the longest by a single, private party.

The search is in advance of the eighth annual exhibit Sept. 17 and 18 in Westport, where Jaguar E-Types will be featured. This year marks the 50th anniversary of the model's introduction.

Called one of the most beautiful cars ever made, the E-Type combined sleek lines, high performance and competitive pricing during its 1961-75 production, show organizers said.

Sponsors have asked that owners submit information, stories and photographs (exterior, three-quarter front and side views, one each) through the website: www.fairfieldcountyconcours.com/enter.html.

"We have always had several remarkable E-Type Jaguars in our show field each year," said Bill Scheffler, the show's chief executive officer and co-founder. "To celebrate the 50th year since its introduction, we decided to make the car one of our featured judging classes for 2011."

Last year, the show conducted a Pontiac search.

The show is a two-day event that this year will begin Sept. 17 at the Fairfield County Hunt Club in Westport, followed by the exhibit and judging the next day.

Organizers said the event would showcase more than 200 of "the world's most extraordinary automobiles and motorcycles spanning the past 100 years." It also includes the Bonham Motor Vehicle and Automobilia Auction.

The event has raised more than $100,000 to support its beneficiary, the Drive to Treat Autism Fund. The fund supports diagnostic and treatment services for adults and children with autism spectrum disorders through its partner, St. Vincent's Behavioral Health Services.

For more info, go to www.fairfieldcountyconcours.com.