I just bought the same binos, i reached out to outdoorsmans and they couldn't guarantee their's would fit the HD plus's. I think because there isn't a thread hole in them, outdoorsmans is more of a little cap with a stud attached, that you tighten onto the bino with set screws. I went with the aziak clamp. After using the outdoorsmans stud and adapter for 7 years, i wasn't sure about the aziak clamp at first but now that ive been using it for a month or so i really like it. It's just one less thing to have to worry about forgetting on the mountain, for example the adapter.