Info needed topic

Just rooted my gt9500 and flashed custom kernel but now i want to revert to stock kernel
Before flashing i made full backup using online nandroid backup under CWM MODE the following files has made

recovery.log
Nandroid.md5
Sd-ext.ext4.tar
Efs.ext4.tar
Cache.ext4.tar
Data.ext4.tar
Recovery.img
Boot.img

I want to know which of these file is stock kernel backup file :confused: