If you don't want to make one you can order one from one of the many knife making store. I had good luck with Jantz.
https://knifemaking.com/search?page=1&q=sheaths%2A&type=product%2Cpage%2Carticle
ELD-X for me, I had a hard time trying to find a good load for the ABLR for my rifle. My friend had good luck with ALBR and his gun. We have compare and have not much difference on terminal performances. Other than the price I don't see much difference. But, is all about what your gun will like.