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Most 6.5s will do. If the bolt pattern is an issue you can put weather stripping on the back of the speaker (like a gasket) and use self tapping screws.
Hmm that's odd. Well I'm no expert on options for each different model year of truck. Perhaps non-premium sound stereos in ext. cab trucks didn't have rear speakers?
I know on my truck they were right in the rear corners of the cab, under the seatbelts.
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