Blind guess follows, since information from OP is unclear..

There is a Chris King headset the frame insert cups are Steel: http://chrisking.com/headsets/hds_steelset.. made to beat up, on a mountain bike.

integraded headsets are cartridge bearings , the frame maker machined the frame for a particular headset bearing.

Trashed one already?, get several at the same time, to tide you over as you beat each of them up in sequence..






Knowing differences means acquiring dimensions by Measuring them , and comparing the measurements...