Check out this photo and tell me if you know what's on this Cobra behind the Terlingua logo, under the mirror. It looks kinda like a genie's bottle (the kind you rub to get wishes). They only appear on the driver's side, kinda like you would put Japanese flags on a fighter showing your number of kills.
Here they are on a Terlingua Mustang Clone of Bill Neale's. She's got 3, she must be a kick-ass driver.
Here they are on this Terlingua Cobra, 1 of 5 CSX4000 Terlingua's done in the late 1990's.