The upper ones on the roll bar are generally mild steel tubes. The bolts are working in shear trying to snap the bolt rather than trying to pull directly out of the threads so you should still get the full strength of the bolt.
Cheers
Stot
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1.6 Mazda B6 : Garrett TBO339 : 420cc WRX Injectors : FMIC : Microsquirt V3 : LC-2 Wideband : Toyota COP
Build Started Jan 2013 : OTR Aug 2014 : Build Pictures
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