givi monolock universal adapter

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Recently, intalled Givi mounting plate to factory carrier on my '13 CB1100. Used 2 of the 4 bolts included with the kit (Z113C) which was enough in my judgement to secure it securely. The nuts are not butterfly nuts but locking style. I attached the plate so that it protrudes beyond the rear of the carrier a good couple inches. This allowed use of the 2 holes on the carrier to line up with 2 places on the mounting plate. The plate is well made of some form of hard composite and seems to be strong enough to handle the cargo weight requirements. I have a 2010 SH150i equiped with the Givi Monolock Topcase and wanted the ability to use on CB1100 as well. I am very pleased with the Givi Topcase and the mounting plate. When the Topcase is not on the bike the plate looks nice and neat. This is my first post so am just learning how to navigate and don't have pics.
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Hello everyone, Does anybody know if the universal mounting plate that coes with the Givi monolock case is made of plastic or steel. It looks like it mounts to your existing rear carrier with bolts, square washers and butterfly nuts. My concern is where the square washers fit into the recess of the adapter plate. If the adapter plate is thin plastic where the square washers attach, is the thin plastic strong enough to support the box and if the plastic becomes brittle over time, will the washers pull through? If the plate is made of steel, then I could see it being very sturdy. Thanks for any input.
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