I have WOW 2.4.3 Burning Crusade,  Is the 3.0.2 addons supposed to work with that version.

If not where can I find the versions of the addons that will work

I don't think they will. with an update the source code of the game changes and things are added etc etc. The addons are created for this changed code and not for the code before it.

and for where you can find them, i'm not sure. i'm looking for them aswell.

i dont think you can even play wow with the 2.4.3 patch unless your playing on a hacked server or something like that. 

It works the same way around, you cant use old addons on the new patch, there where several code changes.

Please, can someone tell me where I can find add-ons for 2.4.3?

If you are lucky, then older versions will be on the download section just above the comments. On WowInterface, they are in the archive tab of the addon. If you are lucky.

But really, you should play on live like 10 million other people, and not concern yourself with such a pointless exercise. Besides, if Blizzard found out you were on a pre-live version server (which automatically makes it a private server) they would ban your account anyway.

FYI. Just incase you didn't know. Now you do.