As an alternative to
trnguyen 's possibly superior solution, here's what I ordered for mine:
17" BMW spare wheel
from ECS Tuning
https://www.ecstuning.com/b-genuine-...l/36116851507/
$67 with free shipping
135-90/D17 Kumho compact spare
from Tire Rack
https://www.tirerack.com/tires/tires...rtnum=39R7KHV2
$94 free shipping
Scissors jack from Amazon
https://www.amazon.com/Xinner-Univer.../dp/B07NVBDNXM
$23 (I like this one because it has a cast drive head not stamped, solid crank not stupid folding, and a rotating lift point to fit the frame pockets
I already had the lug wrench (17mm bolt heads). Had my tire guy supply the stem and mount the tire, whole project $185.