sounds like you saw a DIY setup, I've never seen anything like that on any year panel or in any catalog, so aim your struggling on designing your own and let us know how it works out
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics