What you need is a set of 60deg Wheel Bolts with removable collar from Grayston, a UK bolt manufacturer.

They call them 'Ghia' wheel bolts.

http://www.graystonengineering.com/wheelnutmenu.htm

You can get them from Rally Design.

http://www.rallydesign.co.uk/catalog/default.php

Buy set, fit wheels, sorted.