This air cleaner assembly was in box of miscellaneous parts in a 67 Mustang 289 Parts car. I knew it was obviously not for a 67 289 Mustang. All I did was take it apart and clean it a little. I did some research on Google, Ebay and asked for identification help on Vintage Mustang forum, and everything pointed to this being from a 1973 Mustang or Cougar 351C. If anybody has other thoughts, please let me know. I have seen people asking up to $200 for these. We got what we wanted from the parts car so I don't need to make a big profit. All I want $40 plus shipping.