The Interconnect board is Apple part# 922-7320 and the cable is 922-7319.
Do a Google search and you will find wildly different prices. If it were me I'd pay a bit more to go with a company with a good reputation.
http://www.google.com/products/catalog?client=safari&rls=en&q=922-7320&oe=UTF-8&um=1&ie=UTF-8&tbm=shop&cid=4196137268497338559&sa=X&ei=4BU6TtLmFs3HsQK4vo0u&ved=0CDgQ8wIwAg#ps-sellers