i need to know what kind of speakers i should buy for the rear that are good and cheap(not super cheap) and what size i need to buy. i heard 4", 6" and 5 1/4"

please does someone know exactly what size i need and a suggested brand or model

thankss

 

I think the rears are 5 1/4", but I've seen some people do some modifing and fit 6x9's. I had alpine 150 watt's in my gxl and they were pretty good, not sure how much they were though.