Here This helped me out a whole heap.
http://www.automotiveforums.com/vbulletin/showthread.php?t=321030
-jb
Remove the dash
First you have to remove the dash pad, there are 9 screws I think. 2 are under the defrost vent cover, 2 are in the glove compartment, 1 is in side the fuse panel, 1 is in the other panel on the passenger side, and the other 3 are around the rim of the plastic bezel. You have to remove that next, it just pops off. After that, you will see 3 screws that you have to remove from the CD player and then it will come out.
* Front: 4" x 6" * Rear: 6" x 9" * Front door: 4" x 6" * Rear deck: 6" x 9"
OEM. ? Jensing. ?What would it matter,New 45W 2.5" Tweets are 20$Run 4 off a standard deck.
The deck is the surface to which you bolt the cylinder heads to.
you have to remove the entire deck lid inside to remove the rear speakers. remove the side of the interior that is right on top on the deck lid and covering part of the roof liner. remove the big blk plastic push clips holding the deck lid and carpet to the trunk. it should be able to come out now and expose the rear speakers
4x6's in the front doors and 6x9's in the rear deck. You can install 6.5" speakers in the front doors with a simple adaptor plate. You can purchase it in most car stereo stores for about 12 bucks.
Stock rod length is 6.135 inches, unless it's a tall deck engine, in which case the rods are .400 longer (6.535), tall deck engines were used in big trucks like dump trucks and were usually 427 cu in, if you're talking about a pickup truck or a car it's most likely a short deck version. Deck height on a short deck big block Chevy is 9.800" from the center line of the crankshaft to the deck, deck height on a tall deck big block Chevy is 10.200" from the center line of the crankshaft to the deck.
The ones in the front doors aren't covers, they just look like it. You have to remove the door panel to get to the speakers. The rear deck comes off by removing the rear seat and the rear interior panels. After you do those things you can slide the rear deck off and expose the rear speakers.
Most likely a vanilla beatdown deck
your trunk lid
if you send me an email i will be able to tell its kinda tricky because you have to remove the top panel of the dash to take out the stereo and you dont want to deploy the airbag in the process, my email is bigclop2@yahoo.com
Purchase a replacement
No there isn't. You will need to get a new deck