Lenovo ThinkPad X1 Carbon GEN 5 KEYBOARD ASSEMBLY 01ER623 SN20M08031 01ER664 NEW The difference is only tBrand New, genuine Palmrest & Keyboard for Lenovo ThinkPad X1 Carbon Gen 5 2017 with a part number of 01HY026, 01HY027, 01LX508 or 01LX548. Although it has four models, they are all compatible with ThinkPad X1 Carbon Gen 5.   Compatible Laptops: Lenovo Thinkpad X1 Carbon 5th Gen 2017 (20K3, 20K4) Lenovo Thinkpad X1 Carbon 5th Gen 2017 (20HR, 20HQ) Palmrest FRU: 01HY026, 01HY027, 01LX508, 01LX548 Keyboard FRU: 01ER623, 01ER664 Specifications: Color: Black Layout: US Backlit: Yes Condition: Original, Brand New