I have the E70 X5 with run flats and no spare wheel.
When I put on the winter wheels later this year I will need a spare wheel.
I believe it is possible to buy the spare wheel kit but does it simply go in the storage area under the luguage compartment floor or does that storage are also have to be replaced to accomodate the spare wheel ?

By the way the RFT's are giving a harder ride than our old E53 with normal tyres.