Help with Sportmask Mage Sizing

[Rebel35]

I recently came across someone selling a 2007 Sportmask Mage 2-piece combo in Medium that I am very interested in buying online. 

Only problem is, I don't know if this will fit my head correctly. I am currently in a Bauer NME 8 in Fit 3, my head measures 59.5 cm, which according to Sportmask's site is a Large. I've read many posts on here and other forums that these run big, and I don't know if a medium would work for me. 

Does anyone have any insights into how these fit and if I'd be making a mistake going with a medium? These masks are hard to find now, and the seller has provided some info, but I can't determine if this would work. 

Any insights would be awesome, thanks.