Hi mate, if you get the subframes as well, you should be able to make em' fit, with a bit of work, depends on the subframes really how easy it is. The cobra's i have in my Uno came out of my mate's Cinq and they fitted fine, they had universal subframes as cobra don't make frames for cinq's. But he managed to get em in perfect without much work. (tho he is a welder and fitter so he can make almost nething fit). But the frames weren't to suited to the Uno so just bolted the front of the frames into the original holes left by the other seats, then drilled some holes into the floor and bolted the back of em straight to it.
So in short yes mate they should fit.
***sorry about the really long 'yes'***
MK2 Uno 1.1 Fire
Mk1 Uno 45 S