Bolted right up to factory studs on 1969 Mustang. Not quite flush to metal dash frame, but I don't believe this is a problem. Installation was an easy 15 minute job if the trim panel above the glove box is removed.
The speaker's elongated holes had to be modified to fit the factory dash studs. The thick plastic frame bows slightly due to the speaker weight and won't mount flush with the underside of the dash. They should use a metal frame like the original.
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