Anybody have a Hans Rudolph 7600 they're not using?

Anybody have a size Medium or Small Hans Rudolph 7600 mask they're willing to part with?

I want to try this mask but don't know what size to order anymore (the fitting guides have me confused between choosing the Small and the Medium). Would love to be able to try on the sizes before buying. I'd happily return it quickly and cleanly, or I could pass it on to other needy souls...

Thanks!
John