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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