Clio mk2 (51) speaker help required

[damianbphoto]

Hi all,

I would of joined a clio forum but its only a quick question. Friend has a clio 3dr. Speakers are blown. Have an idea of what to get but have 3 questions..

1. Do I need low profile speakers for front and back?
2. What sizes for front and back?
3. Sound wise, will it benefit from me running 6x9s to the parcel shelf over the panel speakers in the rear?