In regards to the original post, I have personally seen and sat in the seats. If you are a bid guy, 36 waist and up, do not bother with these seats as you will not fit them. When you first look at them they actually look good, but take a closer look and you have some issues. The biggest issue I had was that the foam on the seats were very thin, compressed very easily and did not really hold for. It seemed dangerous how thin the foam was. In little air grommets are all over the seat and are very very thin. There is no real guide for the headrest, you just sit them in place and hope they do not move around too much. The seat itself almost seems paper thin. i would highly suggest you avoid them.
in regards to the Cobra GT3 seats, they are great seats, but anyone above a 36" waste will have a hard time. Those of you in the United States, specifically Southern California, check out Sube Sports in Huntington Beach. They offer and ship these seats and have a lot of different types in their showroom you can check out. They are mainly a supplier for race teams but have excellent customer service for retail.