I have a 97 Cavalier sedan, and I am looking to swap parts into my cav from a sunfire.
Will a stock Sunfire guage cluster fit in the stock cavalier dash without modifications?
Will the stock Sunfire door panels fit in the cavalier without modifications?
to answer both questions: no. the cluster wont work without rewiring and the front door panels wont fit without swaping dashes.
cluster should swap from same year sunfire as the cav. Door panels thats the bad news you need to swap the whole dash in order to make it work. but the cluster you should be able to just plug and play.

2009 Ford Mustang V6
^wrong
clusters are not the same trust me i know...
Clusters are only plug and play swappable in the 00-05 cars.