Spreading the bolts out more would be good but honestly they are so massive anyway if this is the best fit go fit it. Looks like you can make a nice big rectangular bolt pattern?
I would drop the bolts in from the top and put the nuts underneath. If anything vibrates off gravity holding the bolt in place does something compared to a nut flying about inside the case while the bolt is on the road.
That wavy bracket is designed to grip round tube, probably meant for a different type of rack in a universal kit. It'll work as you have it but does look a bit odd. Some nice big washers would be neater (and I'd also bin the plated bolts and use stainless to avoid rust).
Andy
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