absolutely coincidental, my bro took the carpet out of his 205 yesterday. its massively shorter than a micra carpet by about 6 inches, and its about 4 inches too narrow to fit as well.
the only other i know of myself is the mg metro and they are rare
what about trimming a house hold carpet might be the easiest way to get the size u need
u can get thin carpets but it will take time to mould it to shape theres a few other cars that have red carpets like type r civics and seen a 106 on the net with one
just need to keep your eyes peeled and hopefully one pops up