I couldn't find an actual answer specific to the dekagrams, but here is the FAQ from Konig. I'll probably shoot them an email next week to verify.
"A: We recommend using a spline drive, tuner diameter, conical seat lug nuts / bolts (if applicable). Some of our wheels may be drilled to accept a Acorn sized lug nut however, the spline drive hardware mentioned above will work in both single and dual drilled wheels, it has a smaller diameter that comes with a key which helps prevent scratching on installation, and is a small security measure from theft."