Add it to your server
In your server's .ini file (servertest.ini by default), add these to the existing WorkshopItems= and Mods= lines, separated by a semicolon (;).
WorkshopItems=3830675407
Mods=HeadwearExpanded
| Workshop item | Subscribers | Declared in |
|---|---|---|
| Headwear Expanded3830675407 | 16 | description footer |