Hi mate. I look them as well. And I find them in Ebay.
http://www.ebay.co.uk/itm/700c-Teny-Rim-Front-wheel-Track-nut-bike-road-fixie-single-speed-for-700c-tyre-/330902700172?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item4d0b56808c
You can check yourself.
http://www.ebay.co.uk/itm/700c-Teny-Rim-Front-wheel-Track-nut-bike-road-fixie-single-speed-for-700c-tyre-/330902700172?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item4d0b56808c
You can check yourself.