2GB Memory RAM Upgrade for the Lenovo Thinkpad R61 Series, T60 Series, T61 Series, X60 Series and X61 Series Laptops (DDR2-667, PC2-5300, SODIMM) at Amazon.com
X61 | Lenovo Wiki | Fandom
X61, still a great writing/ second machine after all these years : r/ thinkpad
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Lenovo ThinkPad X61S T7500 Core (TM)2 Duo 2.00GHz 4GB RAM NO HDD - NO OS | eBay
Steve Greene's Blog by sgreene570
Lenovo IBM Thinkpad x61s Core 2 Duo L7500 2x4GB 8GB RAM 80GB 12,1 Clean Tested | eBay