Just about any truck parts shop has them. But they all kinda suck. They will work great for a basic AM radio, but if you are looking for a speaker system for a nice sound system the center speaker is not the solution. I would look into building a box behind/under the seat or the kickpanels.
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree
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