I ordered 2 of these a while back and couldn't get them implemented with the blade plugs I had like I wanted to. I recently ordered 2 of Sedsti's Kyber Blade Plugs and inserts, and decided to get a little crafty.
I snapped the top piece of the saber crystal off and finagled the rest of it into place inside the Kyber blade plug. As the below comments about the damaged product suggest, these pieces are very fragile. If you do wish to attempt the same type of modification I made, be extremely careful. I was being careful and ended up snapping my first attempt in half and had to reglue it. I'm very happy with the outcome though. They look great in my windowed US saber. I'll make an additional post with the lit product.