Buffalo Yeast Strain?

Anyone got an idea of what yeast is referenced in the New Belgium Side Trip BPA

http://www.newbelgium.com/beer/side-trip

***Brouwerij Van Den Bossche led Bouckaert to the brewery’s family Buffalo yeast strain

Got a brew session with a buddy who wants to try and clone this up. and trying to decide between 1388 1762 3522 or wlp575