Here’s my MGF seat setup in my Vitesse Saloon
seat fully back no interference (only just )
seat fully back , inertia belt position inclined to rear , no interference
Rear right post , aluminium spacer tube , can measure if you want
rear left post , wiring is for heated seats
front posts , half of rear posts , again can measure if you want
I used the original seat holes and have the instructions for conversion somewhere
Paul