they svt seats will BOLT in where your stock zx3 seats do, however the latches dont latch, you need to modify them to get them to work (or so ive read)... i know a few people around here have done it... wait for them, but i think what i have stated is correct... they will fit but you need to mod the latches.
I doubt the seats are a different size since all Foci have the same wheelbase it would seem the front and rear seating would be the same at least dimensionally. I would guess that the latching might be different as said above.
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