Got my A1181 09' MacBook 5,2 running a 500GB SSD, 4GB Ram, and pushed it from the max OS of El Capitan to Mojave with a patched install USB I put together (:
Apple MacBook A1181 13.3" Laptop Intel Core 2 Duo, 2GB RAM, No Hard Drive | eBay
4GB Memory for Apple MacBook and MacBook Pro Mid/Late 2007 Early 2008 Ram A1226 A1229 A1181 MA897LL/A MA896LL MA895LL MC240LL/A MB881LL/A MB404LL/A MB403LL/A MB402LL/A MB063LL/B MB062LL/B MB061LL/B at Amazon.com
Apple Macbook A1181 2.0Ghz / 2GB RAM / 500GB HD | eBay
Apple MacBook A1181 13.3" Scr 2.16GHz Intel and 50 similar items
How to upgrade RAM memory in MacBook A1181, A1185 laptop - YouTube
parts-quick 4GB Memory for Apple MacBook Late 2007 Intel Core 2 Duo 2.2 13" inch Black MB063LL/B A1181 DDR2 PC2-5300 SODIMM Compatible RAM at Amazon.com
A-Tech 4GB Kit (2x2GB) RAM Memory for MacBook, MacBook Pro - PC2-5300 667MHz Ram A1261 A1260 A1181 A1229 A1226 MA896LL MA895LL MB063LL/A MB062LL/A at Amazon.com
APPLE MAC BOOK LAPTOP 2.0 GHZ 1GB RAM Model: A1181 | eBay
MacBook Core 2 Duo RAM Replacement - iFixit Repair Guide
A-Tech 1GB Memory for Apple MacBook and MacBook Pro PC2-5300 667MHz Ram A1181 A1150 A1151 A1212 A1211 MA611LL/A MA610LL MA609LL MA092LL/A MA601LL at Amazon.com
A-Tech 1GB Memory for Apple MacBook and MacBook Pro PC2-5300 667MHz Ram A1181 A1150 A1151 A1212 A1211 MA611LL/A MA610LL MA609LL MA092LL/A MA601LL at Amazon.com
A-Tech for Apple 4GB Kit 2X 2GB PC2-5300 667MHz Mac Mini iMac Late 2006 Late 2008 Mid 2007 A1208 MA589LL A1207 MA456LL A1200 MB138LL/A A1176 MB139LL/A Memory RAM at Amazon.com