Not aware of a repo sling. You can use a K98k sling without the button
here is a pic of the KKW and K98k slings. The DSM looks like the KKW sling.
I'm not sure if the number of button slots is the same. I would have to check my
DSM sling which is put up right now.
The DSM sling has one hole for the stud and a buckle like the kkw. (See pic). One guy selling on eBay and gunbroker makes repro's for both if you give him good pics. He's made a couple kkw slings for me and they are close including the stitching unique to these. He has my close up pics of originals or probably still has them.
Hello, Check out this website weslermilitaria.com I have bought a couple from Him. He has both DSM and KKW plus other slings. I was very happy with the quality. Good Luck Gary
Important; be sure to show him a correct sling for the DSM. His pictured version will work, but isn't quite an accurate reproduction. Also for the kkw, his pictured version has too many holes. Ask for four holes and period-style stitching. The buckles are too narrow, but it is impossible to find an exact match (at least it was for me).