Thanks for the words guys. YEah stuff used car dealers, con artists.
Looking at replacing the stereo soon, can anyone give me a heads up on this?
If I remove the stock double din cassette tape will I be able to use the brackets on a standard head unit?
I was thinking of just putting a plastic sleave below. Also, I've heard the front door speakers are 5.25" with a 1" tweeter.
Has anyone tried the apline spr-50c?
http://www.alpine.com.au/showItem.php?item_id=225

WHATEVER YOU DO dont loose the stereo bracket
yes the bracket will fit a single din unit, you can use the plastic din tray to cover up the gap or go for a double din unit.
speakers are a weird size but you can still fit 6.5inch speakers from memory, thats what i have i think cant remeber now. you need to use spacers for them to fit and need to trim the door trim to fit them
if i was to do it again i would try and keep the door trim intact and fit the stock sized speakers
tweeters are in the doors.
dont bother replacign the speakers in the back they are not going to make much difference.
as for addign a sub do a search there a few different ways to do it
cheers

Cheers for the heads up.
I'll have a look at the factory speakers over the weekend and have a look around :)
Not sure if i'll bother doing a sub.

You can run 6.5" splits up front behind the original covers. I ran some high end infinity splits in mine. I deleted the rears and had a custom ported 12" sub behind the passenger seat. It blew me away how good it sounded. 

For anyone interested, I ended up putting 6.5" woofers and new 1" tweets in. Just through a new alpine head unit with no amp, and disconnected the rear speakers. Pretty ballsy little setup for $300. I managed to not break any clips also :)
 
Car has been going good, found a small leak in sump gasket but will sort that out this week.

Replaced sump gasket and has stopped all forms of dripping. Hooray!