38T 104mm SS ring...
http://www.ebay.co.uk/itm/Shimano-Zee-Single-Speed-Chainring-38T-104mm-BCD-FC-M640-/191593913540?hash=item2c9be31cc4:g:sKQAAOSwl8NVbwaR
or
http://www.ebay.co.uk/itm/E-thirteen-Guide-Ring-guidering-38T-MTB-chainring-104BCD-7075-T6-5mm-thick-/282271504459?hash=item41b8b1584b:g:UWsAAOSwHMJYO0Vn
?
The Zee one will be fine and is cheaper.
@hippy started
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38T 104mm SS ring...
http://www.ebay.co.uk/itm/Shimano-Zee-Single-Speed-Chainring-38T-104mm-BCD-FC-M640-/191593913540?hash=item2c9be31cc4:g:sKQAAOSwl8NVbwaR
or
http://www.ebay.co.uk/itm/E-thirteen-Guide-Ring-guidering-38T-MTB-chainring-104BCD-7075-T6-5mm-thick-/282271504459?hash=item41b8b1584b:g:UWsAAOSwHMJYO0Vn
?