Winter wheel/tire fitment 2018 i3s

Hi friends. Hope someone out there can help figure this out with me. I have a 2018 i3s. Tirerack has a winter wheel package with the Rial 19x5 wheels and Blizzak LM500 tires. My concern is the offsets. I think I will need spacers so they will fit correctly. Here's what info I know so far.

Stock on my 2018 i3s
Front - 20x5.5 with 33 offset
Rear - 20x6 with 39 offset

Winter Wheels/Tires are
Front and Rear 19x5 with 43 offset

Need to see what front and rear spacers are needed to make the fitment work.
Also, need to know can I use my factory wheel bolts as I will probably lose some threads bolting them on, correct?

I really appreciate any knowledgeable help. Thanks.

I would like an answer for this, also, if you find out/have to figure out out yourself. I'm also wondering if you will need to add i3s wheel flares to keep your fenders from being destroyed by flying road debris. As well as whether or not the larger footprint of the tire will keep the rear end planted when brake regen kicks in on ice.