I bought my 2015 4 door Cooper used and fell in love with it. It had everything I wanted except for leather seats. The seats were stained but everything else was in great shape, and like I said I fell in love with the car. This Christmas my partner got me leather seat covers that fit perfectly. In fact they are better than the original John Cooper Works seats. Since I have the anthracite head liner, the black leather covers give me a total black interior. The covers fit just as described in the link. I was a little leary at firs when she said she ordered then from China. they did take a month for shipping, but they are perfect. I am at work now but I can post pictures of my interior now if any one wants to see later in the week. Here is a link to the covers:
Great F54-56 Leather seat covers

https://www.aliexpress.com/store/product/Brand-New-Imported-PVC-Material-Union-Jack-Style-Black-and-Rear-Seat-Cover-For-mini-cooper/1080030_32828921913.html?spm=2114.12010615.0.0.5df a3e3bWCmuM7

 

Here are the new seat covers

 

Man! Those are gorgeous

 

Wow! They look great. Replacement leather seat covers . . . from China . . . Whodathunkit? Easy to install?

 

Yowsah!!! Nice!!!

 

They were easy to install, and the seller sends you a video of how to install them.