I installed similar topbox on mine but due to vibrations and "Chinese" steel quality, the rear rack cracked at the bending just bellow the blinker bracket. One side a time.
Welded them, but then one of the sides broke right next to the weld, so finally I got it reinforced with a additional "diagonal" support. Only done that this winter so will see how well it'll behave now.
Just keep that in mind and observe that area for indications of cracking.
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