My brain suddenly started working again, I remembered that the information is available in the Pegasus racing catalog. It was on top of my monitor. Anyway, here is the information: -3 3/8-24 -4 7/16-20 -6 9/16-18 -8 3/4-16 -10 7/8-14 -12 1 1/16-12 -16 1 5/16-12 Jörgen Karlsson Gothenburg, Sweden.