It would be an echo of what has been posted here. You'll need to take up Velomine's offer.
Facebook post examples:
"A standard threaded headset will fit fine."
"Spacers will work. They just fit where the flat washer is between the top nut and the adjusting nut."
Top nut and adjusting nut space isn't the issue, it's the space where the bearings sit.
Edit: You can post pictures now.