Your prior post didn't indicate you were ordering 2 kits to make a partial set of headers for a mega.
I was looking at it from the point of view of if being a partial kit, when I know it takes 3 10-pin headers and 7 8-pin pin headers to populate a mega.
And 3 6-pin headers won't fill the 18-pin header because the overall width of the 6-pins stacks up & causes fit interference. An 10-pin and a 8-pin do alslo, but isn't too bad.