You need to look for an old school bmx headset 1" threaded you can find them now and then on ebay Chris King makes one probably costs more than you paid for the frame
I have a small collection of Chris King headsets (10+). I love them , just hate the cost. For some reason I was thinking the "Hornet" had like a 34 mm headtube. I guess I will figure it out Saturday when the mailman busts a nut putting the box on my porch.