Apple Computer, MacBook Pro Core 2 Due 13-inch 2.26Ghz 2.53 Ghz, Apple Order Number, MD990LL/A- MD991LL/A, Model Number, A1278, Model Year, Mid 2009, Part Name, SDRAM 4GB DDR3, Manufacture Part Number, N/A, Compatible Apple Order Number, MB990LL/A, MB991LL/A,, Compatible Model Number, A1278, EMC Number, EMC-2326, EEE Code, N/A, Compatible Apple Computer Family, MacBook Pro (13-inch, Mid 2009)
Order you product here: 661-5227 SDRAM 4GB DDR3 1066 SO-DIMM for MacBook Pro 13' Mid 2009 A1278 MD990LL/A MD991LL/A, 661-5227
source http://info.applepartsellers.com/661-5227-sdram-4gb-ddr3-1066-so-dimm-for-macbook-pro-13-mid-2009-a1278-md990ll-a-md991ll-a