Stereo & Electronics - I need new speakers

what size are the speakers in a 97Z, i did a search on the net and there saying 6 1/4 in the front doors and 6x9's in the back seat but nothing about the hatch speakers.. im looking for better sound so im up grading my speakers.

if these sizes are wrong please inform me with the right sizes thank you :)

6 3/4 front doors and sail panels. hatch speakers are 4"

6 3/4 front doors and sail panels. hatch speakers are 4"

thanks