I agree with with Dizzie but if like me u aint got the cash to put doorspeakers, just get high quality replacements like i did. JBL and Infinity make the best 3.5" mk2 dash replacements. I've got 75w "infinity 3002ci" ones which are the best you can get for that dash. They are current range and cost me ?45, they look so slick with their silver cone. I've also had 60w JBL GTO302's which were good but old now.
The speakers can be hard to get but with a short-arm screwdriver its much easier.
I might aswell sell my infinity ones because im selling the car, and i'm swapping the originals back in. Unmarked condition, in the box with manual and warranty, only a couple of months old...