If you have the stock battery box like mine, they probably won't fit. You may need to replace that as well. Mine will barely fit 2 group 27's and it's a tight squeeze. I've had those Duracell batteries in my boat. They're good batteries. I have one group 31 for cranking and 1 group 34 for the trolling motor.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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