You will need a resistor to reduce the current correctly, something like a 560 Ω Resistor will be suitable, if you go this route I have several am happy to stick in an envelope for you.
Otherwise if you want plug and play...
Heres some someone has pre made http://r.ebay.com/DBUsuv for single led a nice 10mm will be fine.
Otherwise look for '12 v LED'
If you do want an LED with resistor, I can see what I have got and send one to you too...
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