Where to buy a 72w battery for a 2018 T480

I just bought a 2018 T480 and I noticed the 72wh battery can be chosen in the machine customization page on the Lenovo site.

The problem is in the UK they don't list the T480 battery for sale (yet?).

Apparently it's the same size as the T470 batteries. Can I just buy one of those? Any ideas?

Thanks!