So, I find myself a little stuck. I've found a pair of shoulders that I'd like to turn into a custom item - one with no actual ingame item currently associated with them.
I found the associated NPC, Qiaga the Keeper...
I found the associated model, lshoulder_robe_d_04 / rshoulder_robe_d_04
And finally, the associated DisplayID number, which is APPARENTLY '69450' - according to both WoWModelViewer's 'Save Equipment' function and NPCFind.
Yet when this is my input for the Item Forge, it claims the DisplayID does not exist. I'm curious as to why this is - as I've seen that others have been able to make custom stuff from NPC-only items: Legion Demon weapons or even, more similarly, Archmage Arugal's Shoulders. Am I doing something wrong?