What booster seats don't require the car's headrest?

[Maisie&BodensMommy]

My mom is looking for a booster for her car for my 7 1/2 y.o. niece. She has a '00 honda civic, and says the back seat headrests don't go up.
Which high back boosters don't require the car's headrest? My niece is pretty tall, but I don't know her seated height. She's supposed to be getting that tomorrow.
My mom wanted to get the pronto, but then we read that the pronto requires head support from the car's headrest...

 

[LISmama810]

Last I knew, only Dorel (Cosco, Safety 1st, Eddie Bauer) require vehicle support up to the child's eyes. That's for high-back, of course. Backless you always need support.