For Sale on this forum is my little used Kappa (will also fit Givi) top plate assembly, support struts etc plus all fitments and fitting instructions. I think mine is monolock ( but I don't know the difference between monolock/monokey). However on my " for sale " post, you can see the plate fitments, and see where the plate fits on to the top box. I had it all supplied and fitted with a 42L Kappa top box, by a Suzuki dealer to my 2021 650 Strom ( bike now sold ) for 3 months only from new. All the bits are present as per SR 3112-KR3112. Cost to me fitted new was £105.95. Selling for £50 plus £9 postage.