Can Kenmore gas grills be converted to natural gas?

We just got a Kenmore Elite propane grill and we want to convert it to natural gas. The manual even has a model number for a conversion kit that goes with it. However, everytime we try to talk to sears about it they keep telling us that Kenmore grills can't be converted to natural gas. Our grill even says on the front of it that it is conversion ready. But sears keeps telling us that they don't make a conversion kit. We don't know what to do. Did we just blow $1000+ on a grill wr can't even use with our natural gas line?