There is nothing magical about a heating element. I'm sure its sewen/glued/taped into the seat. I'd google aftermarket heated seat element. You just need the wire. May have to modify/eliminate the factory plug for what ever comes in the element.
http://www.heatedseatkits.com/heatedseatkits/index.html
Thread claims Napa carries a compatible aftermarket element-
http://www.chevytalk.org/fusionbb/sh...105a73dccd9a7/