Thank Peterbaron. The Honda boxes use a plastic "universal" mounting plate that the box latches to, and then an interim model-specific steel plate that attaches the "universal" plate to the model-specific rack.
The two racks have different hole spacing, and was wondering which type of rack the plate fits.
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GO, I have long used and appreciated GIVI for their simplicity and ease of installation, etc. But with increasing competition, they have gotten more complex in fit and applications.