Hal has them. They are located in the Addon brand section. They are $19.95 if memory serves me correctly.
I have a homemade set. My buddy bought a pair and when I tried to order mine they were on back order. I then went to a upholstery shop and bought a quality piece of foam and used an electric knife to cut mine out. We used his set for a pattern. I ended up with about $6.00 in mine. The only problem with them was they were a bright green color. I painted them with good black paint and it worked perfect.