Mine has rear mount speakers in the back but off of the cargo area attached to the sides, just to the back sides of the back seat. It works and sounds perfectly.
4"
The front speakers are 4" and the rear speakers are 5 1/4 "
http://www.helium.com/tm/756435/isuzu-rodeo-honda-passport
The 1999 Isuzu Rodeo typically accommodates 6.5-inch speakers in the front doors and 4-inch speakers in the rear. It's important to check the depth and mounting requirements to ensure a proper fit. Additionally, some aftermarket options may vary, so consulting the specifications for your chosen speakers is advisable.
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