All OEM wheels fit all Stinger trims from '18 through '23. If you find out otherwise it will be a first on the forum for me. AWD GT trims came standard with 18" wheels 8" wide, over Brembo brakes, of course. GT trims are more commonly seen with staggered 19" wheels, even my AWD GT1 came that way. As I recall, in 2018 as the Stinger was delivered in the US, northern states all got the AWD models in squared 18" wheels - and a lower speed limiter too, which pissed a number of drivers off, but it did say that in the brochures, just in small print. Hah.
If you are using the GT-Line wheels for winter, why not stay with 225/45 tires? They will grip better in the snow than 245 wide tires will.