They actually do have S5, W1 and W2, at least their catalog says they do.
I talked to them earlier today, they wanted over $100 for a 24" flat of O1, and the W2 wasn't that far behind. Not to mention they acted like it was a hassle to sell anything less then $50000 worth of metal.
It's okay though, just fund a set of leaf springs from a Chevy for $20. :)