check out SoundDomain.com or Crutchfield.com , they both have a good "fit guide"
Try to use the Nissan speaker adapters plugs so you don't need to cut wires and mess up the electric system, you can get those from eBay or amazon.6x9 component in the front, 6.5 rear door.
The rear speakers in a 2002 Nissan Frontier measure 4 inches and are located in the back doors. The front door speakers measure 6 3/4 inches.
front 6x9, rear 6.5
The 2010 Frontier have 3.5 tweeters (Front dash) 6/9 front doors and 6.5 in rear door.
2000,nissan frontier speakers size-------6 1/2 Try to use the Nissan speaker adapters plugs so you don't need to cut wires and mess up the electric system, you can get those from eBay or amazon.
The 2005 Nissan Altima has door speakers that are 6.5 inches. If you are replacing your speakers, you can also use a 5.5-inch size.
From what I can find out, it seems to be 6.5".
They are 165mm size
They are 4x6.
6.5 inches
Factory replacement info:In-dash stereo 7-1/8" depth; Size code DD,I Front speakers Dash: Tweeter factory speaker note Front Door: 6-3/4" Rear speakers Rear Door: 5" Try to use the Nissan speaker adapters plugs so you don't need to cut wires and mess up the electric system, you can get those from eBay or amazon.
both front door and rear deck have 6x9's