I looked at several aftermarket under seat storage options for the narrow extra cab rear seat on the 1st and 2nd design GMT800 chassis Silverado/Sierra light trucks. They didn't work for me.
GM made two and since it's been more than a decade since the last GMT800 rolled off the line they are both discontinued;
- DISCONTINUED 12498846 - GM Under Rear Seat Storage Bin- 1999-2007 Chevy Silverado/ Gmc Sierra - Extended Cab Only. These were over $300 when they were available. The lid latch locks with keys.
I include this GM stock picture just in case someone sees this in a U-pullit.
More pictures of the BIN storage here. https://www.dieselplace.com/forum/76...html#post78827
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** The above is for information only. I did not find the above BIN**
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What I did find is this...
- DISCONTINUED 12498114 - GM Under Rear Seat Storage Divider- 1999-2007 Chevy Silverado/ Gmc Sierra - Extended Cab Only. This includes a lower seat cushion locking bar with keys.
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My installed divider... It's nice to have carpet on the bottom to keep the gear rattles to a minimum and the emergency tire Jack access is not an issue with the divider. Both are in the plus category... The Bin likely would cause issues with the jack and the hard plastic bottom would be noisy. Not to mention the loss of about 1-2" of depth.
I was thinking about building a plywood and speaker carpeted under seat bin til I found one of the discontinued GM 12498114 Under Seat Storage Divider kits still in the bag for $65.
Here's a PDF of the tri-lingual Instructions that come with the kit. English, Français, & Español.
129984 Installation Instructions PDF
IMPORTANT NOTE: The instructions contain a fairly obnoxious error in Operation #3 in all three languages. I highlighted the offending word.
The retaining bracket in Figure 4 is
NOT on the Passenger side. It is on the
driver side.
Attachment plate Driver side. This also where the inside bracket is installed despite what the instruction sheets state in step 3.
Passenger side attachment plate and lock.
If you are liberating one of these from a wreck be sure to get the locking bar from the seat support.