I have the larger model (MY12) smart keys but one of them does not have the emergency key. I plan to get an uncut one from eBay.
However, it seems that all sellers sell only ones that fit the smaller smart keys. Not sure if it can fit the larger one or not; or where can I get the larger uncut emergency key?

 

As I have both old and new fobs I can attest that the emergency key will fit in both as the key has not changed since day one of the x351. IMHO

 

Does this mean both smart key versions can be tuned to use for the same car?

 

Yes as I have all 4 programmed to my XJ