I use the same booster seat they use in the car. Once a child outgrows a traditional car seat, a booster is often used. (I believe the theory is that it better positions the child with respect to the shoulder strap.) The ones I use sit on top of the cushion in the back seat of my -4 and are compatible with the (4-point) harness. This allows the children to see over the cockpit coaming and enjoy more of the view. In my case, it is necessary to remove the rear stick which would interfere with the booster.
Good luck,
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