Hi
These aren't perfect, but i think it might be the closest we can get.
Front: 185R15 is the same diameter as a 205/70VR15. Pirelli make a 205/70WR15 Cinturato CN12 https://www.longstonetyres.co....-cinturato-cn12.html . I think that is pretty good.
The back is a little trickier. However Pirelli have also made some special tyres for the rear of the Muira SV. It is a 255/60WR15 Cinturato CN12. https://www.longstonetyres.co....-cinturato-cn12.html Now my assumption is that this will be a bit smaller in diameter than the original 225R15 or 235R15, as in theory they should be 80% profile tyres. However there is tolerance within the measurements and there is a chance that these original rears were not actually a proper full 80 profile.
There are a few attractions to this set up:
they are W rated
they are Pirelli
From ythe side they look a bit like the CN72.
the 255/60VR15 CN12 is the talles widest road tyre i know of with a decent speed rating an without horrible white letters on the side.
What do you think.
If you look on those web pages that have put links to you will see pictures of the tyres and if you scroll down you will find the dimesions of the tyres.
There is a picture of the CN72 on here https://www.longstonetyres.co..../cinturato-cn72.html