Radius Risers from Nippy N?

[BiG DoM]

Are these risers for the 1200 definately 20mm higher? I want to fit them to a HP2 but want to be sure they are higher than the OEM's. Anyone use them?

http://www.nippynormans.com/prodinfo.asp?number=GRP-1208S&variation=&aitem=3&mitem=4