Heater delete option is kind of rare. I heard only cars exported out of country or ship to Hawaii could have this option. I had a 68' 4 door dart with this option.
i have two of em, my dart and valiant were ordered heater delete, as was my d400 truck.
i buggered up the valiant's firewall plate with a couple holes to mount the remote filter.
as far as i know they were ordered in florida and hawaii, but not sure about other states... surely not alaska !! lol