We've got the B202 that is pictured in TryMe's link with the B107 height adjuster. You will also need the clamp which attaches to the pylon, which does not appear to be pictured in any of the photos on that link.
Check to see if you can find one that is used. I bought ours from the original owner of our Epic 22 for about $100 for the whole setup.
If you have questions, contact the company. I had a question a few years ago and I got an e-mail back quickly from the company's owner, Mike Seipel. bifh@mindspring.com.