We offer three different 1957 Chevy speakers. All three of our 57 Chevy speaker models will provide you with stereo sound from the original, mono location.We offer these speakers in two different styles, a dual dash mount and a dual voice coil. The dual dash mount speakers consists of two, 3.5" speakers that are mounted in a board to fit 6"x9" speaker mounting holes. The 1957 Chevy dual dash mount speaker is available with either Custom Autosound or Kenwood 3.5" speakers. The otheroption is a dual voice coil speaker which is a 6"x9" speaker with two tweeters. One tweeter is for the left channel and the other is for the right channel in orderto provide you with stereo sound. We recommend the dual voice coil speaker as it offers better mid range response due to the larger cone surface area.