Does anyone know where I can get the fresh air vent cable assemblies for my non-AC '69 vert? My car does not have the Astro Ventilation, so just has the knobs under the dash on each side. One of my mounting brackets is broken, and the drivers side cable sheath is split. I can find a lot of replacement knobs for sale, but not the entire assembly (cable, bracket and knob). Help? Thanks.