Focus Coils

[LukeSimon]

I am having trouble finding cross reference information for 1960s color TV focus coils. Is there a JW Miller catalog that covers 1960s color TV focus coils? I can only find their older 1950s catalogs. How interchangeable are different models focus coils? How many different focus coil models did the aftermarket brands make (such as Thordarson and JW Miller)?

Is it possible to use a voltage divider, like used in solid state TVs, instead of a focus coil?