you carnt buy them for the micra..the standard rails have to be modified to suit the bucket seats...
i manged to fit my cobra clubman to my standard frame as the 2 front bolt holes lined up. but the rears are way out. it was only held on with 2 front bolts and no rear ones...it wasnt very safe LOL
iam not sure. i didnt give matt a thought lol. he might sell them. but i know nowhere else does them. the guys in japan fit corrolla ae86 seat frames (they are the same bar one bolt hole that needs drilling)