These stands are designed specifically for silicon flats and are part of the collection of Flint Qatar collection (https://www.cgtrader.com/3d-model-collections/collection-of-flintlock-katars). You can download these stands for free and use for any purpose.
Technical Details:
-Texture Size: 4096x4096
-Textures for Unity5: yes
-Textures for UnrealEngine4: yes
-Textures for CryEngine3: yes
-Physically-Based Rendering: Yes
-Polycount - 3100tr.