Useful link here, although I'd assume 285/40 x 15 is unfortunately a bit too narrow for 12" wide Stratos rears?

Cooper do these which aren't; but NB low speed-rating, and classification as more fit for use on 4x4s or Mustangs:

https://www.mytyres.co.uk/rshop/tyre...5S-RWL/0039602