4GB Memory Upgrade for ASUS K Series Notebook K551LN DDR3L 1600MHz PC3L-12800 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
OFFTEK 8GB Replacement Memory RAM Upgrade for Asus K551LN (DDR3-12800) Laptop Memory at Amazon.com
How to install SSD in Asus VivoBook S551 | Hard Drive replacement - YouTube
ASUS VivoBook S500CA-SI30401U - Ultrabook - Core i3 3217U / 1.8 GHz - Win 8 64-bit - HD Graphics 4000 - 4 GB RAM - 500 GB HDD (24 GB SSD cache) - 15.6" touchscreen 1366 x 768 (HD) - with 32 GB ASUS WebStorage (3 years) - Walmart.com
Asus Vivobook S551LB / V551LB review - a good 15.6 inch ultrabook
SSD Upgrade for Asus K55N 256GB/512GB/1TB/2TB | eBay
Kefu New Ux581g Mainboard For Asus Zenbook Pro Duo Ux581 Ux581gv Laptop Motherboard I7-9750h I9-9980hk Rtx2060/6g 16g/32g-ram - Laptop Motherboard - AliExpress