Hi Angela. I have purchased so many devices over the years and luckily kept all of the receipts. What you are looking for is called a Teekoz Harness. We purchased it from Southpaw Enterprises, Inc. Their number is: 1 800 228-1698. When we purchased the unit, it cost $175.00 and was worth every penny. Tyler absolutely loved using it. The bungee straps were extra (go figure!), but can also be purchased through the same company. Get the double straps. They last much longer than the singles. Let me know how it goes.

Wow, I found their website and the Teekoz Harness is still $175.00! I am very surprised. They have a picture of it on the site. You can reach them at www.southpawenterprises.com.