I have a 1967 GTX convertible, 440, 4-speed car. I would like to get an accurate production number for that car with just those filters. I have found some data that states 2050 Plymouth "B" body convertibles (Belvedere & GTX) were made in 1967. If 2050 is correct for total convertible production in 1967, how many were GTX , 440, 4-speed cars? Thanks for any input.