The full color types are for the general service uniform (jacket, shirt, and great coat), parade, and Ausgehen uniforms. What you need for the camouflage uniforms are the subdued field rank like this:
The buttons and ties are correct for the Strichtarn uniform. For the other uniforms the buttons are metal, either sliver or gold (General).
You should be able to find the subdued type pretty easily and cheaply on German eBay. A quick search shows this seller has lots of the subdued types to choose from: