S3 2001 Bose front speakers not working - replacements?

All speakers in the Bose system are 4" on the 8L A3. Tweeters are 1".
You really need to replace like for like as they run at 1 ohm impedance, so even low impedance replacements will only deliver less than half the power from the Bose amp.
If you have no sound at all from the front then I doubt it is a speaker problem as the tweeters should still work, more likely the Bose amp.
Instructions are here for removing the door cards:
http://freepdfhosting.com/7f903e1adb.pdf