Something like this should do the job: http://www.ebay.co.uk/itm/Aluminium-Spacer-M6-x-18-Standoff-Stand-off-Bar-Turned-GWR-Fasteners-/271655485504?var=570488342698&hash=item3f3fedc040:m:mhfWtpR97BgtR3-R_EYUC8g
Although as mentioned, you'd have to get a new QR as well.
Having just spent £18 on a pitlock I'm keen to not get rid of it instantly. Good backup option though I suppose
@chiroshi started
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Something like this should do the job:
http://www.ebay.co.uk/itm/Aluminium-Spacer-M6-x-18-Standoff-Stand-off-Bar-Turned-GWR-Fasteners-/271655485504?var=570488342698&hash=item3f3fedc040:m:mhfWtpR97BgtR3-R_EYUC8g
Although as mentioned, you'd have to get a new QR as well.