I have for sale a BOG-POD brand Universal Shooting Rest. I bought it without realizing I had one already. I opened it before realizing the same thing, but it may as well be brand new as I just put it back in the package, and its been that way since. 
this rest fits in the Adrenaline Switcheroo System,but you would have to check to see if it works on other Big-Pods. 
If you have any questions, feel free to send me a message any time and I'll get back to you as soon as possible.    Thanks