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Since there seems to be a neverending supply of people asking what size speakers fit, I thought I'd search and find out exactly what does fit. This is the list I have come up with. Please don't post saying "NO! That's not right!" unless you can show some proof. I actually went through several pages of posts(plus having installed stereos and speakers in several different probes) to find this stuff.
If anybody knows the mounting depth of the speakers that they have, and would like to share, that'd be great.
1st Gen(all years 89-92)
Front: 6.5
Rear('89): 6.5
Rear('90): 4x6, 5x7, 5.25, 6.5 (thanks to anomaly)
Rear('91, '92): 4x6
Front mounting depth:
(all years): 2 1/8"
If you must have deeper speakers, there is a little bit of space in front if you have a good spacer. +
2nd Gen(93-94)
Front: 5.25
Rear: 5x7/6x8*
2nd Gen(95+)
Front: 6.5
Rear: 5x7/6x8*
front mounting depth
(all years): Slightly greater than 2 1/8. I say this because the depth for 1st gens is known. When I had my '91 sometimes the speakers would rub the windows when they were rolled down. With the same speakers int my 95, they only touch the windows if the door is slammed when the windows are down. Take caution though, as this can cause damage to windows and/or tint.+
On factory amps:
First Generation Probes with premium sound have a small factory amp under the front passenger seat. Second gens with premium sound** have an amp behind the plastic in the forward section of the trunk on the passenger side.
*5x7 and 6x8 have the same size mounting hardware. The only reason for the different sizes is manufacturer preference. 6x9's will fit in the 2nd gen rear spots, but it requires a bit of cutting of the metal(also anybody who has pics of installed 6x9's and the cutting required, please post!).
**It's possible to have a factory amp without having premium sound
+this is from the back of the mounting plate to the tip of the magnet. Sometimes manufacturers list the depth this way, sometimes they list it as from tip of the tweeter to the tip of the magnet. The best way is always to measure yourself, both the cars allowances and the prospective speakers dimensions.
If anybody knows the mounting depth of the speakers that they have, and would like to share, that'd be great.
1st Gen(all years 89-92)
Front: 6.5
Rear('89): 6.5
Rear('90): 4x6, 5x7, 5.25, 6.5 (thanks to anomaly)
Rear('91, '92): 4x6
Front mounting depth:
(all years): 2 1/8"
If you must have deeper speakers, there is a little bit of space in front if you have a good spacer. +
2nd Gen(93-94)
Front: 5.25
Rear: 5x7/6x8*
2nd Gen(95+)
Front: 6.5
Rear: 5x7/6x8*
front mounting depth
(all years): Slightly greater than 2 1/8. I say this because the depth for 1st gens is known. When I had my '91 sometimes the speakers would rub the windows when they were rolled down. With the same speakers int my 95, they only touch the windows if the door is slammed when the windows are down. Take caution though, as this can cause damage to windows and/or tint.+
On factory amps:
First Generation Probes with premium sound have a small factory amp under the front passenger seat. Second gens with premium sound** have an amp behind the plastic in the forward section of the trunk on the passenger side.
*5x7 and 6x8 have the same size mounting hardware. The only reason for the different sizes is manufacturer preference. 6x9's will fit in the 2nd gen rear spots, but it requires a bit of cutting of the metal(also anybody who has pics of installed 6x9's and the cutting required, please post!).
**It's possible to have a factory amp without having premium sound
+this is from the back of the mounting plate to the tip of the magnet. Sometimes manufacturers list the depth this way, sometimes they list it as from tip of the tweeter to the tip of the magnet. The best way is always to measure yourself, both the cars allowances and the prospective speakers dimensions.
6-11-07...T-boned and totaled. 
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