That's exactly what I've done. My M5 has the M mobility kit, and I was able to build one almost exactly the same for my 7. I put it into the hole underneath the trunk shelf. Now to be honest I don't trust the M mobility kit in either vehicle so if I am going on a real road trip (more than say 3-400km) I just throw a winter tire, jack, and tools in the trunk in the off chance that I do get a flat.
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