I've measured mine, and they're 390. I'd be prepared to sell what I have, but there is work required.
I have 2 pairs. One pair have been rattle canned red (not by me), and are in fairly poor condition.The steerer is 6.25" long and 1.125" in diameter. The other pair are in better cosmetic condition but at some point they lost a bonded dropout. I got these from a local bike shop who cut the steerer down to stop anyone attempting an amateur repair. My plan was to combine the 2 into 1 nice pair, but I don't think I'll ever get around to it.