I have sold a set of locks before for the front (lug bolts).  I haven't seen them for the nuts, but I am sure that they are available too, if I call my supplier.  Do you want locking lug nuts or bolts (or both)?

Thanks,
Ken Wilford
John 3:16
www.vanagain.com
Phone: (856)-765-1583
Fax: (856)-327-2242