I have used a monopod at racing events in the past with my Canon film gear and 300mm lens. The majority of folks (and myself) did not have a head on the monopod. But this is completely up to you.
When shooting sports events, you are usually at the "level" you need to be, so with the monopod extended up/down/whatever, you have the lens at the right level to capture the action. The head would merely provide you the ability to keep the monopod on the ground, sort of vertical and tilt the camera up or down.
If you think you need this, then I would check the heads, as most monopods I have seen do indeed have the thread size of the camera, and not the tripods. If you need to use a head on a monopod, I would say the best one to get is a ballhead with one knob. You do not need a seperate pan or tilt lever (or any lever sticking out for that matter). One quick knob turn, get the angle right, lock and shoot.
Hope this helps...
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