No, they're 2 totally different bodystyles
Yes
Pull the inner door panels off and the speakers are mounted in the door.
Pull the inside door panels off and you will see there bolted in the door.
no
They will fit but the trim and materials may not match
Remove inner door panel for access
They will, but outside moldings will be different and interior door panels will differ as well
I believe the handle and locks are configured different. Also the locations of the screws for the armrests etc. May be able to be done but going to take some mods.
ive found them for between 125.00 to 225.00 depending on the condition of the door
No, because the two years have two different body styles
An instructional video on how to take a door panel off a 1999 Sonoma can be view on YouTube. Search for "How to remove door/door panels 1999 Sonoma/s10" and click on the first search result.
That was a common issue with the 1996-1999 two door coupe.