You are best with the mod adapters from JS Ramsbottom - https://www.jsramsbottom.com/guntuff...etta-92fs.html
You can then fit any 1/2 inch UNF threaded moderator. I have one and it works well. The original Umarex moderators are only cosmetic and are like hens teeth to find
Apologies, I can't find a way to add photos to the post!