In the article the guy say he "retired them for a very nice set of factory walnut grips" ... so maybe they're available from SIG. Worth checking out. On the other hand, you might not have a choice of exactly what they send you (my just be the next set off the shelf), so they might not be as nice as his. Alternately, you might look at Altamont grips. I know they have them for SIGs and the quality/look of their stuff is generally very nice. I'm not sure if they have checkered ones, though.