Congrats on the Car awesome and unique color combo , The one option I see missing is Carbon Ceramic brakes.
On the spacers , I heard Future classic from IND is really good , I think its there brand , they give you longer bolts for the wheels and a longer bolt for the rotor hat , you use the rotor hat bolt to support the spacer you use in the hub , it’s a nice idea
https://ind-distribution.com/collect...r-kit-14mm-lug
And with the spare I know they should have one my MB E63s had a collapsible spare it was small then when you put air in it unfolded and blew up to a full size tire pretty cool still need ample space for it .
I keep a plug kit in the car with me the factory pump is good to fill the tire , if you get a blowout your sol anyway got to call a tow truck, I feel the tires are pretty good today a blow out is more unlikely than a screw in the tire so the plug kit comes in handy