For what it's worth, and probably true for almost any saddle you buy - I've been using Kontact saddles for years and they have a 30 day refund policy if the saddle doesn't work for you. Even if you 're not interested, their website has an interesting section on how sit bone measurement may or may not work for any particular type of saddle. Worth reading regardless of what saddle you use.

All that said, there's no way to pick a saddle other than trying it, imho. If your old saddle was good for you, buy another. If not available new, look on EBay.