Question Re. Wheel Locks for Volk GT-C's
 

Can anyone explain what wheel locks you actually need for the Volk GT-C? It seems standard wheel locks (ie. made by Kyokugen) do not work for the GT-C and in fact Volk makes a special sized wheel lock for the GT-C. (is that the only wheel lock that works?) Also, is one set of wheel locks ( 4 total, 1 wheel lock for each wheel) pretty much enough on wheels like the GT-C or is it common practice to put on even more wheel locks for each wheel?

Any info would be appreciated!