In the past, I have had both Metro seats, with sub-frames, and Ford Seats.
The Ford seat has it's own sub-frame which is a similar shape to the Metro's.
I got my seats for free, so had nothing to lose by experimenting.
I was surprised how well they fitted!!
1)At the back, the Ford sub-frame needs narrowing to clear the Minors sill.
Cut down the frame and re-drill the mounting holes (5 minute job!).
2)At the front, the frame needs washers or spacers to take up the slight difference in height on the Minor floor (play around to get a good fit).
3)Mark and drill the new holes in the floor.
4)Bolt down the new seats and enjoy!
They really are that simple to fit.
Cheers