While you're measuring the diameter also measure the depth of the hole, this will require removing each speaker. Typically the OEM speakers are very shallow with a small magnet. If thjere's space available a deeper speaker of the same dia. with a larger magnet will give you better bass response as the speaker cone will have more area.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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