You're correct. The one the racers want is the one no longer made. They have a newer 404 that they use that is still in production, but if I'm not mistaken it's only sold to their timbersports guys?
I was at a GTG at Kevin's place and definitive Dave had a box of chains he was selling for 5 bucks each, there were a few of the old 3/8 non-anti vibe chains in there, I snagged up a bunch. A few minutes later there was one of the big racers from MI (can't remember his name right now, he has hundreds of saws and his brother had a 3 cut record for some class) who saw me carrying them, he offered me 20 each for them. It's a lot like racing tractors in the stock.classes, in order to win, you have to have the right tires, or you're just spinning your wheels.
Remembered, Hesel (spelling? ).