Find the viability of each and add them. I got 75% for one and 27% for the other so you can assume 1 vial at 102% (production date is 4 months prior to date stamped on vial). Uncheck the "Calculate Viability from Date" and type in 102%. Move the growth factor slider until the "#Vials or packs needed with starter" shows 1. So for example, for a 5 gallon 1.054 lager starter on a stirplate, I get a 3 liter starter for your 2 vials.
Fermenting: Azacca Oat Pilsner, Egregious-ish, Barrel Fermented Dreg DelcoLambic, Sacch Trois Helles
Drinking: RIS v7, Doppelbock, RIS v6, Carrot Blossom Cedar Mead, Sauerkraut Fermented Gose, Gueuze, Brett Blonde, Kriek, Saison, Sour Blonde
Barrel aged: Rye Barleywine, Tripel, Wee-Heavy