1998 Cavalier stereo help....please!

My drivers ed teacher has a 98 cavalier (its not her drivers ed car, she has a 2001 impala...long story on the cavalier).

Anyways the kid before her had a custom stereo. All the speakers are still there and she has the radio, but i need a diagram. Also, I think the system was hard wired...so is it still possible to hook up the stock radio?

Could someone provide me with a wiring diagram too?

Thanks.

well i dont know if this is what ur asking for but radio removal (http://www.carstereohelp.com/stereoremovalChevyCavalier2.htm)