Hi Hot Rod. They mounted up very solid. The stays came with the mounting hardware for the factory Honda leather bags. So once I cut the lower tabs off the stays and had them welded couple inches aft and orientated inwards it allowed me to drill and mount the bag in four locations.
Now as for the quality of these hard cases, only time will tell. They are made of an ABS plastic and I am not sure how they will hold up but they are light.
I will see if I can get a picture of the stay.