There is no point in getting HIC bars for a THREADED FORK. Invest in a threadless fork and ICS or just regular sized bars (NON-HIC) if you want to keep rocking threaded.
LOCKNUT is all you need for threaded headsets. You can use threadless headsets on your fork to make it spin better, but you don't need HIC or any compression OTHER THAN your locknut for THREADED forks.
HOWEVER... and I hate saying this because the whole concept is inane... the HIC should work on your threaded fork (i think. Never tried. Never will..) as long as your headset is set up right, the starnut is installed, yada yada.
sounds kinda .. rude/dickish but it's unnecessary to use hic on threaded..