I saw the post below on a French movie car webpage
http://www.imcdb.org/yourcomments.php?id=mozinor&PHPSESSID=e79101ea41a843601fe7a7aedbeced63 I have written a couple of articles on the history of the TCA dune buggy driven by McQueen in the film. I suggest you find a copy of the APRIL 2005 issue of the new KIT CAR BUILDER MAGAZINE. Briefly, here are the facts: 1)
The body was a modified Meyers Manx. 2) It was built at Conn-Ferr by Pete Condos and Eckley Turr. 3) It used a 140 hp Corvair engine. 4) It used Firestone racing tires from Granitelli's turbine car. 5) American Racing cast special extra-wide rear wheels. 6) The floorpan was a stock early VW. 7) The transaxle was a swing-axle with a flipped ring & pinion.

The engine adaptor was made by Ted Trevor. 9) The late Tony Nancy did the interior. Seats were from a Datsun Fairlady. 10) Two tonneau covers were made. The flat one with a luggage rack was used. 11) McQueen bought the buggy after filming, and sold it to a Manx dealer. 12) The dealer sold it to its current owner in Hawaii. 13) There was one matching replica built, with a 4 barrel carb. It went to Texas. 14) There was one extra body produced before the fiberglass shop burned to the ground. No others were made. 15) The body owned by Mr. Adkins is a nicely-done look-alike, but there are numerous differences from the original film buggy. 16) The side panels on the Adkins buggy are different. 17) The fiberglass nose and dashboard on the Adkins buggy are different. 18) The original film car used a flat aluminum plate for the dashboard. If anyone has further questions, my email is:
bartonlink@sbcglobal.net. He's talking about a buggy on this webpage:
http://danadkins.net/dunebuggy.aspx