did the same thing.
Buy a Fairlady Z badge, Just use the Z bit, They are cheaper than the 350Z badges. Got mine from the states via ebay
http://www.courtesyparts.com/genuine-35 ... _881_1243&
http://www.ebay.co.uk/itm/JDM-NISSAN-35 ... 3f0e799ba5
be careful, there are chrome ones around (cheaper), you require satin finish or satin black. You may wish to contact the ebayer to confirm its satin finish as pictures dont look great