This is a remix of the frame inserts of https://www.printables.com/model/185966-busch-jaeger-duro-2000-frame-insert. It is made for the dual keystone adapter by @SebastianMayrhuber https://www.printables.com/model/726353-busch-jaeger-keystone-adapter-single-and-dual.
Since I used the Duro 2000 insert for the shape, it will also fit Duro 2000 frames.
The author remixed this model.
Fits keystone adapter