Noobie query for toilet inlet hose

[Casper]

Fitting a new burlington toilet, but not sure about what kind of attachment I need here. The pipe is 15mm and I presume I need a male-female flexihose (see picture) but these seem hard to find. Can I use a 'nipple' and if so what size would that be since I don't understand how these measurements are meant to map to imperial.
The space is a bit cramped too, about 10cm between the toilet and the pipe.

 

[ShaunCorbs]

https://www.NoLinkingToThis/p/flexible-tap-connector-with-valve-15mm-x-x-300mm/3558g

Will need to turn the water off

 

[Aquarius]

Also make sure that pipe is clipped, otherwise it might cause noise or leak depending on the pressure.