What size are the rear speakers of a 1992 Nissan Pathfinder?

I am trying to replace the rear speakers of a 1992 Nissan Pathfinder and I am having a heck of a time finding speakers that fit. After being led astray (several times) by Best Buy employees I am getting a little annoyed. Anyone out there know? Thanks.|||6x9 is the usual size for rear speakers.|||www.crutchfield.com