Cracked Screen Sony Experia play - Hellllpppp !! Need advice and you all seem like experts

Hi I am new to this so excuse me if I don't make much sense. I have a sony experia play and it has a cracked screen. I know someone who can repair it for me if I get the part, and this is where my problem comes in. The phone still works perfectly well, so Is it "Replacement Digitizer Touch Screen Glass Dislay For Sony Ericsson Xperia Play" that I need to buy. There's one on Ebay but I don't want to spend money and then buy the wrong thing.

Thank you

Sue xx

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