Help needed again....BASIC AUDIO HELP

[new here]

Ok

I have a 54  tdi mk5 4dr.

Just discovered that there was no sound in the back due to the fact that there are no speakers there.

What i need to know is,what size can i put behind those speaker covers.I dont need anything really lour of bassy,just something nice and crisp with a semi decent bit of baseline.

Links to e bay or ideas would be f**king brilliant.

Dont wanna spend loads either.

Thanks in advance

[Hurdy]

Simplest thing to put in would be some 2 way coax's. 6"-6.5" (165mm is the metric size used) should fit in easily.

http://www.bassjunkies.com/Speakers/Coaxial+Speakers/
http://www.caraudiocentre.co.uk/category_m-speakers_c-87.htm
http://www.sextonsdirect.co.uk/sd_coaxialsepakers.asp

enjoy