I have been trying to get one for a 2018/19 BMW F48 X1 for a few weeks, my car came with the usual goo kit - BMW will not sell me the "space saver kit" as, I think, they are unhappy with returns because it will not fit properly, (flat) in the boot without modification to the floor - they don't admit to this but it is only available as a factory option when you order the car as they have to replace part of the boot floor so that it will fit.
so far I have got them to agree to supply me with the bare wheel, but they will not fit the space saver tyre - I have to go elsewhere to source that and get it fitted