Mine recently passed an MOT with 3 point harness. Ive made adapter bars to fit the original vaux subframes and they seem fine. U can get ppl in the back but its a struggle, slide one seat forward and the other back, then sort of fall in ! :)

i modded the standard corsas subframes to fit my monaco on

i wanna get a set of cobra clubmanns wiv the sliding subframes how hard r theese seats to fit and will my car pass the MOT wiv the sliding frames as it doesnt if the buckets r fixed does it and will peops be able 2 get in the bak cheerz