If you need files for 3D printing or digital modeling (often provided in .STL or .ZIP formats), you can find them on several hobbyist platforms:
: Provides historical camouflage skins like the M42 Duster of the 4-60th , used during the Vietnam War. Historical and Technical Documents
: This search engine lists various 3D models from across the web, including free and paid files. Gaming Skins and Mods
For players of games like War Thunder , custom "skins" are often packaged in zip files:
: Hosts community-created skins, such as the Lebanese Phalangists or "Twin 40's" versions.
TM 9 7218 M 42 Duster Twin 40mm : US Army - Internet Archive