Fitting bucket seats on original subframes

[Wigady]

Hi guys

Sounded like a pretty simple idea to me but I can't find any info on it.

Basically I'm looking to get a pair or cobra seats for my pug but wanna avoid paying ridiculous subframe prices like the plague

Does anyone have any experience or seen a guide on how to fit buckets onto standard runners?

Hopefully it's just a case if some drilling, not using it for race or track all it has to do is pass MOT standards

Any help greatly appreciated