I just looked thru some of my notes and found some dimensions I measured.
HD 03 Stem length: 7.06"
KTM bearing height with race: .61"
HD 03 stem race c-bore depth: ~0.60" (this needs to be checked / confirmed)
Next time my front end comes off, I'll take more dimensions, but as I recall, the top bearing did sit about 10-20mil about the stem top.