Please Check Compatibility.

To find specifications of your machine:
Select "About this Mac". You will find the serial number and year of the machine in this window.

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Compatible Model:
MacBook Pro 13" Unibody A1278

Compatible Subfamily:
MacBook5,1 Late 2008: MB466LL/A (2.0 GHz Core 2 Duo)
MacBook5,1 Late 2008: MB467LL/A (2.4 GHz Core 2 Duo)
MacBookPro5,5 Mid 2009: MB990LL/A (2.26 GHz Core 2 Duo)
MacBookPro5,5 Mid 2009: MB991LL/A (2.53 GHz Core 2 Duo)
MacBookPro7,1 Mid 2010: MC374LL/A (2.4 GHz Core 2 Duo)
MacBookPro7,1 Mid 2010: MC375LL/A (2.66 GHz Core 2 Duo)
MacBookPro8,1 Early 2011: MC700LL/A (2.3 GHz Core i5)
MacBookPro8,1 Early 2011: MC724LL/A (2.7 GHz Core i7)
MacBookPro8,1 Late 2011: MD313LL/A (2.4 GHz Core i5)
MacBookPro8,1 Late 2011: MD314LL/A (2.8 GHz Core i7)
MacBookPro9,2 Mid 2012: MD101LL/A (2.5 GHz Core i5)
MacBookPro9,2 Mid 2012: MD102LL/A (2.9 GHz Core i7)

APN:
922-8785, 922-9091