What RAM do I need to buy?

hi, have 2010 uni-body white mac book. has 2.4 ghz core 2 duo processor. apple says maximum ram 4gb numerous other sources 8gb. @ moment have 4gb, upgrade 8. no idea ram need buy though... suggestions? had on crucial scanner thing seem think goes 4gb too, there no 2*4gb modules suggested. (if use link, preferable if uk )
much

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sorry, should of left link one. 1 work?
http://www.crucial.com/uk/store/partspecs.aspx?imodule=ct2kit51264bc1067&cpe=pd_google_uk

 

run scanner crucial, tell can install:


http://www.crucial.com/uk/systemscanner/macos.aspx

 

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