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The side plates differ in that one is reinforced with a rib and the other is formed of flat sheet metal. This provides a little compliant to thermal elongation of the cross bar and of the engine itself which would bind the bar if set too tightly between more rigid mounts.
I recommend setting the bar so the 13mm balls just sat and then give a 1/2 turn extra on the stud with double nuts to keep it seated.
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Paul Abbott
Weber service specialist
www.PerformanceOriented.com
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