They use the same Hogue grips as the 4506... do an internet search for "hogue 06010" and you'll find lots of 'em.
Update: Hey, J. Solo... I just noticed that I hit my 1000th post with this reply. I think I have a set of 4506/1006 Hogue grips in my spare grip box, PM me with your mailing address and I 'll send them to you as my "Karma gift" for being my 1000th post on the forum.
Last edited by Gunhacker; 07-05-2012 at 02:26 PM.