Base wheel replacement issues/concerns

Refractor999

Hello all! Needing some help (again) with wheel/rim sizing; this time though, I have the specifics and just need to know if it will fit correctly.

First of all, I have the base model Z, so to the best of my knowledge I have 18 X 8's in the front, and 18 x 9's in the rear. Right? Also, if I am correct — the offset of the fronts are 43 mm, and the rears — 18 mm. So far so good?

So here's the million dollar question: the wheels that I am looking at are 18 X 8's, and they have an offset of 40 mm. Assuming that I went with the these: (1) could I simply put them on and use then with the tires that are already on my base model rims? And (2), what would be the result as far as performance/issues? If there would be significant problems, how could this be fixed?

Thanks so much everyone?

Oh, please let me know if anyone is looking for a set of the base rims.