the deluxe version was the only one that had the fancy dash control panel, the others just have a variable resistance switch [hi-med-lo] in that delete plate - the dealer installed seems to mostly have had a lighted plastic knob switch like the one visible
upper left here - the factory standard had a knob that matched the other dash knobs, as seen
upper left here I also got a pic up of the 4th 'standard' style, that I think was available 55-57
here - would have the same rotary switch with matching knob - I'd expect yours would match one of those shown as by 57 there wasn't much need to go with 3rd party heaters
Bill
