Banebots 775 Pinion Pressure Angle (14.5 ? 20 ?)

Anyone happen to know for certain what the pressure angle of the pinion gears that fit RS-775 Banebots sells at this link.
http://banebots.com/p/S24P-GMC1-50

We won’t get ours for at least another week but we need to order mating gears for them.