Mod Squad Challenger just auctioned, only 2 were made in 1972 that were convertible, both were for the tv show

see this gallery of the restoration of one at http://www.streetfire.net/photo/mod-squad-challenger-tv-car_1304342.htm or see a feature in Mopar Muscle Sept 1987
One just sold at Mecum at Monterey auction for 48500

The 1971 Dodge Challenger Convertible offered was one of the two or three cars used for on-screen work during the 1972 Mod Squad season. Since Chrysler discontinued Challenger Convertible production after 1971, this car was updated with 1972-specific front and rear components, creating an interesting hybrid. Highly optioned with an automatic transmission, bucket seats and a console, it was also used as a PR/show car in period. Today, it displays an exterior refinish dating back 10 years