Tyres - odd sizing?

[PeeDeeBee]

Just had a rapid puncture on the front drivers side and had the AA to recover to home using one of their universal space savers.
Looking online at mobile fitters, and trying to figure out what I want to put on it. I'm erring towards doing both at the same time, but looks to be 5mm left on the passenger side. A few sites are showing the size associated with the reg as 215/55/R17, versus 215/50/R17 which are on the car at the moment.

Any particular recommendations? CrossClimate2 which seem to be a pick of All Season tyres are of course the most expensive of all.

 

[Jomarkh]

Just had a rapid puncture on the front drivers side and had the AA to recover to home using one of their universal space savers.
Looking online at mobile fitters, and trying to figure out what I want to put on it. I'm erring towards doing both at the same time, but looks to be 5mm left on the passenger side. A few sites are showing the size associated with the reg as 215/55/R17, versus 215/50/R17 which are on the car at the moment.

Any particular recommendations? CrossClimate2 which seem to be a pick of All Season tyres are of course the most expensive of all.

I put CC2's all round on my MG5.
Always change as a pair if going for a different tread pattern.

 

[PeeDeeBee]

Is there any any guidance what size the emergency spare should be? Just had a look on ebay at something like this:
Emergency spare

I wanted to try and verify it before buying blindly.

 

[Jomarkh]

That looks like one from MG