6 7/8".
Be careful removing the bows from the side rails. They have a little bend in them at the end that makes removing them 'difficult' if not done at the right angle. The side rail metal is VERY thin around the holes for the bows and its easy to elongate the hole. You may want to practice on the LeMans first.
Don't ask...
__________________
Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express 
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