I believe it is a 4*6
The bed size is 6.5' of a dimension of 78x9x5 would fit a Chevy 1990 pickup.
it should be 4x6....
Dashboard are 4x6 rear corner are 4x10
According to crutchfield.com my 1995 Chevy c/k 1500 extended cab pickup has 4"x6" speakers in the rear pillar but you can fit a 4" with a bracket of course
in the front doors their 6 1/2 in the back for a pickup their 4x10
4x6 in the dash 6 1/2 in the front doors
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4X6 speakers
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the size of the speakers are 6.5" round