Finished fitting a new set of seats. Got hold of some Sparco Torino seats with runners.
The ka being based on the mk3.5/4/5 fiesta/puma chassis means I needed to rob some "tophat" mounts from an early fiesta out the scrap yard. The reason for these is it brings the rear inner bolting point level with the floor cross brace meaning its dead easy to make the inner bracket.
Then used some 5mm aluminium strip and angle. used 5mm as that is whats needed thickness wise to conform to FIA rules so if its good enough for them then plenty safe enough for road and odd trackday use. The inner mount is as simple as the flat alloy strip with the end 40mm hammered down to meet the angle needed for the front bolt.
The outer runner mounts are 2cm (iirc) lower than the inners so i have used 2 pieces of angle to make and s shape bracket to increase the hieght. Nothing special just requires a bit of thought with a tape measure before you drill!!
Now i could just use off the shelf sparco subframes but IMO they put the seat too high so fabricating my own mounts keeps them nice and low.
This is the end result:
You can see at full rearward position how much further back The seat can go compared to the drivers normal seat (also fully back).
You can see how much lower they are in this shot:
And the drivers side all done:
Sit a few inches lower which was the aim and it means i can push the seat back a bit further to give a better seating position.