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For this particular application I'd suggest staying with the larger surface area of conventional wirwound resistors.
The black metal housing they mount in is a convection chimney which is intended to pull in cooler air from below and flow upward across the large surface of the original ceramic wirewounds and out the top. Smaller package resistors will run significantly hotter unless they are mounted on a large heat sink. Heat dissipation is all about surface area and air flow.
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