HP Envy x360 Convertible 15-U 15T-U Series Silver Laptop Top Cover Palmrest Without Touchpad and Keyboard 774608-001. 

HP Part Number: 774608-001
Compatible Part Numbers: 830194-001 812879-001 37Y63TP003
Compatible Models: HP ENVY 15-U001XX X360 CONVERTIBLE PC HP ENVY 15-U002XX X360 CONVERTIBLE PC HP ENVY 15-U010DX X360 CONVERTIBLE PC HP ENVY 15-U011DX X360 CONVERTIBLE PC HP ENVY 15-U050CA X360 CONVERTIBLE PC HP ENVY 15-U110DX X360 CONVERTIBLE PC HP ENVY 15-U111DX X360 CONVERTIBLE PC HP ENVY 15T-U000 X360 CONVERTIBLE PC HP ENVY 15T-U100 X360 CONVERTIBLE PC HP ENVY 15T-U200 X360 CONVERTIBLE PC