HP 745889-001 - Upper CPU cover (chassis top) - For use on models with a 15.6-inch display and a 2-button TouchPad Retail
HP 738709-001 - Top cover - For use on models with a 15.6-inch display and a 4-button TouchPad Retail
HP 745890-001 - Upper CPU cover (chassis top) - For use on models with a 15.6-inch display and a 4-button TouchPad Retail