there ya go, ellerbro. Keep in mind the Tubus clamps come in 3 diameter ranges, so measure your fork before purchasing.
Additionally, Blackburn is the traditional source for bike rack "P" clamps, but have been difficult to source thru vendors the last couple of seasons. Any capable LBS should be able to get some standard P clamps for you.... at the bike shop I work at I think we're selling "Delta" rack brand P clamp sets in several sizes. should be in QBP... I think Jannd has some as well....