What size are the stock speakers in a 89 se

[240sxin]

i knwo this is stupid to post but im to lazy to look to see what size the speakers are and i cant find on any site what size they are, so i was wondering if anyone knew what size thery are i want to get a new stero system and need to know the sizes so i can look up the right speakers. thanks guys.i drive a 89 240sx.

[allthrottlenobottle]

4x6 front and back