We offer three different dash speakers for your 1973-1976 Chevy Nova without air conditioning. Two of them are dual dash mount speakers, while the other is a dual voice coil speaker. The dualdash mount Nova dash speaker consists of two, 3.5" speakers that are mounted on a board with a bracket. The dual voice coil speakers consists of a bracketed speaker with two tweeters, one for the leftchannel and one for the right. We typically recommend the dual voice coil speaker. Since sound is essentially moving air, the larger mid-range cone on the dual voice coil speaker providesbetter mid-range response and the speaker has a higher peak power rating.