I can't really say much about how much they would stiffen the structure without detail on tubing dimensions, etc. as compared to the stock piece. The first one pictured does connect all the way around which is good, but some of the tubing looks awfully flat, which doesn't provide much in the way of bending or torsional stiffness. The second one pictured doesn't even connect from the front section to the rear section, so it's probably not serving much of a purpose.
And just for reference, there is no such thing as a grade-8 metric bolt. Metric bolts are classed 8.8, 9.8, 10.9, etc.; grade 2, 5, 8, etc. are for SAE hardware.
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