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I think your talking about this

http://www.polyperformance.com/shop...ntrol-Arm-Track-Bar-Hardware-Kit-p-28601.html

Vs this

http://northridge4x4.com/shop/nr4x4-jeep-jk-hardware-kit

Because of this
http://www.wranglerforum.com/f33/the-importance-of-changing-out-stock-bolts-128154.html

I would go with the cheaper northridge kit. Metric class 10.9 is the metric equivalent of SAE Grade 8. I just found out that 8.8 is equal to grade 5 when shopping for longer bolts to mount my winch. This link backs me up.
http://k-tbolt.com/bolt_chart.html

It's similar to the way a 19mm socket is very closely equal to 3/4". They are perhaps very slightly different technically, but for all practical purposes the same.
 
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