If you can find them, and are willing to pay the cash, look for a set of BMW Vader seats. By far the most comfortable seats I've ever been in. They really are Recaro seats I believe just reupolsterd in leather and (in my case) ///M logo. But mine are 12 way adjustable. Just have a great feel. Now if I could have gotten them without the leather... (your arse slides all over when cornering hard, not a big fan of it. That and leather is too damn hot in the summer for my tastes -- I don't use A/C)
First off, are they really race seats? If so then they will have a FIA, SFI or some other number associated with them.
If they don't, then they are show seats. Racers have rules and governing bodies who approve of safety equipment. To get approval there has to be testing. My money says that Tenzo has never crash tested anything.
My very affordable ($200 each) Corbeau seats happen to have an FIA stamp on them.
BTW www.subesports.com has alot of options for you to pick from, their price is not too bad either. With Cobra seats you can order brackets along with the seats, install is easy just unbolt your stock seats and bolt these on