I have installed multiple times. Just call carefree or A&E, or whichever product you want, they will tell you exactly how to measure correctly. Likely get a better quality than whatever Keystone provided as OEM anyway and more choices.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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