Fitting 17cm Speakers help

[sbarber11]

hi im thinking about buying these speakers for my clio mk2 01..

http://www.online-caraudio.co.uk/shop/speakers/alpine/6-5-inch-17cm/alpine-spr-17c-446305.html

does anyone know how to fit them because i heard that i have to get some speaker adaptors to fit them.. sorry im new to this and just wanted some advice before i buy them.. thanx