Snow Drift
[Off-Road Assist] Activated
Actually 245/50-19 is just over half an inch taller than stock. That might fit, but the issue is they aren't going to fit on the 9.5" wide rims. 255s are already stretched on these rims, 245s just aren't wide enough.
As far as Winda tires, personally I'd stay clear. There's just no reason to buy a very suspect tire when there are so many outstanding choices. Cost really isn't an issue either. The Vredestein Wintrac Pro is an outstanding tire that is also low priced compared to others. There other choices too. Hakkapeliitta, Michelin, Bridgestone, Pirelli.
Specification Sidewall Radius Diameter Circumfer. Revs/Mile Difference
255/50-19 5.0in 14.5in 29.0in 91.2in 695 0.0%
245/50-19 4.8in 14.3in 28.6in 90.0in 704 -1.4%
You are correct about the width issue. The stock 9.5" wide rims are an issue, so you will need 8.5" rims for a 245/50-19. Assuming one fits.