Justin, not sure where you're at but we just found a great solution at Costco. We bought a Brookstone Automotive lumbar cushion--cooling gel memory foam no less!--yesterday for $14.99. Item #1347911.
We got the new machine this weekend and she loves this cushion--perfect size and color. It even has a strap that reaches around the seat to keep it in place.
Really appreciate the info. I took the teryx4 out on Saturday with the dog for about 20 minutes to circulate the fluids and keep the battery up. I am going to show her the link tonight and will update. Thanks again. Shes excited to drive it comfortably without the jumpy throttle on bumps. We are moving on the 16th (next sat) so it may have to wait until after the move but I want her to try to make sure fitment is good for the summer riding season lol.
Orange 17 Teryx4 LE, 4.5k winch, Full windshield, Roof, quadboss front rack, full size front spare tire/wheel