Can someone PLEASE help me!!!

I´m looking for some bolts for my 9 inc. rear axel on my rally car Ford Sierra Cosworth Gr. A.
The bolts are for the crown wheel.
I need 10 pcs bolts in the strongest/hardest (10.9 or 12.9) steel.
The bolts are in inches and in Denmark we only have millimetre. I have tried Ford Motor Company in Denmark and they can not help me as this is a Motorsport spare part.
Measures: 7/16 ´´ UNF.
Length: 20 mm (13/16``)

Please see picture and technical data on this link:

http://www.rallycar.dk/default.asp?g...s%2Fbolt%2EJPG

Best regards

Søgaard Rally Team
www.rallycar.dk