This is what the 
button's for :laugh:
I was one of the first on the AOC to fit bucket seats into an Almera.
TBH you're best getting a well known brand of seat if they don't come with subframes cos it makes buying/adapting a pair easier.
Mine were Recaros from an EVO V - I bought Recaro sliding subframe/rails from a Fiesta (eBay) and got my local accident repair centre to weld/alter the brackets to suit the Almera seat mounting holes (cost £300)
The K12 has airbags in the seat IIRC so you'll need to find out the resistance...
(don't measure this with a multimeter or they'll go bang !)
...and make up a plug, ideally using the existing seat connector with a resistor soldered across the pins
