The "classic' white walls also came on early Performers (up through 2004) and earlier Genesis (and related era) grills. All the same 8" wheels.
part # 99252 or 63050 or 3621 should get you there.
I want a pair also.
Around 2005, depending on the model, is when the 8" wheel changed, and then changed again, and then more recently changed again.