Damn Steve, you're a good detective, or mind reader?
from the IMBD site;
The Bradys all drove Chrysler Corporation vehicles (until the final season). Mike Brady drove a 1968 blue Dodge Polara convertible in the pilot; a 1969 Plymouth Fury III convertible also blue; second season a 1970 Plymouth Fury III convertible in blue; a 1970 blue Plymouth Barracuda convertible in year three; <u>
a 1972 Plymouth Barracuda convertible in year four (actually, it was the 1970 Barracuda convertible modified with a 1972 rear tail light panel and front end grill. Plymouth dropped the Barracuda convertible in 1971. ) </u> ; also there was a 1972 blue Chevrolet Impala convertible; a red 1973 Chevrolet Caprice convertible; and a bronze 1974 Chevrolet Caprice convertible in year five. The "Bradys" 1974 bronze Caprice was also used in an episode of The Odd Couple in 1975. Carol, on the other hand, drove only two vehicles: a gold 1969 Plymouth Satellite wagon (first season); a gold 1970 Plymouth Satellite wagon; and a gold 1971 Plymouth Satellite wagon (which took the "bunch" on their infamous Grand Canyon trip). Also a gold 1973 Plymouth Satellite wagon (with the big bumper guards) in the last season. The vehicles were loaned to Paramount by the Chrysler Corporation and The Chevrolet motor Division for filming. Incidentally, the 1969 Plymouth Fury III convertible that "Mike Brady" drove was recently restored to showroom condition.
http://www.imdb.com/title/tt0063878/trivia
Here is the site with the "Brady Cuda" photo.
http://listoftheday.blogspot.com/200...l-tv-cars.html