Ive seen a few people fit the 19" kluger rims. However, from what i can see, the kluger (7.5" wide) wheel offset is 30mm, and aurion (7" wide) wheel is 45mm, so if my maths is correct, the kluger wheel will poke out 27mm more than the factory sportivo. I cannot tell you if that will cause issues or not sorry. The tyre size you would run for this wheel is 225/40/19 or 235/40/19
https://tiresize.com/calculator/
I ended up fitting 18" CHR rims which are 7" wide, with a 50mm offset. Perfect fit. I originally used 235/45/18" to keep the exact same rolling diameter as factory, but with mine being on lowered springs, i found 225/45/18 eliminated tyre scrubbing
https://www.wheel-size.com/size/toyota/aurion/2007/#region-audm
https://www.wheel-size.com/size/toyota/kluger/2015/#region-audm
https://www.wheel-size.com/size/toyota/c-hr/2018/
Im not sure how people are using aftermarket rims because ive found the toyota uses an extended shank style wheel nut with shorter studs. When trying on other rims i found conical wheel nuts didnt have enough turns to safely grip the thread on the studs