If its like the ones that come up in an ebay search for “kart radiator” (they all look pretty much alike), then I can tell you that I’ve used one of these before to race Tag. It worked fine, but you can pretty much assume that you will break one or more of the mounting tabs off on the first weekend. Once you accept that, and reinforce all the tabs (ahead of time), it actually cools just fine. Some of the series we race have a tendency to destroy radiators, because the drivers don’t know where the brakes are. So, a cheapo radiator that works, can be a money saver.
KartLift Kart Stands
DeepSeat Kart Seats
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I used the radiator from a 1998 Honda Civic until it got banned for impeding the vision of drivers behind me. If your local track will let you use it, Autozone sells it for about $60. Some brands are American-made. It sits on two rubber bushings and you’ll have to fabricate a mount of foam, wood, or Lexan and fiberglass to accomodate it.