Not that I'm aware of. I think it's too cheap to make money out of. However, some products do make use of the 'door jam' idea. Jungle Gym XT has those red ovals which allow one to anchor them to door lips, or around pullup bars. However, even at its shortest, it's too long to train human flag from, nor hanging leg lifts (from a door lip), and you can't use them for GB's 'back slings' either.

That's why I thought this 'equipment' was cheaper, lighter, smaller, and more versatile than even commercially available products like the Jungle Gym.