Its my Red one that I am breaking.....
Since I bought the car the drivers door had never closed properly, and Ive seen lots of GTA's with rotten pillars.
To repair this properly, you need to cut away all the fibreglass around the pillar area, so you can get to the metal upright, and repair/replace as nessecary. Another problem is this pillar connects to the steel windscreen surround, so in worst case you have to remove the screen/pillar..
Before I broke it, the door must have dropped by about an inch when opened, only held on at the top hinge by the fibreglass, which was starting to split.
The corrosion around the seat belt mount has happened within a year or two. Two years ago, I retrimmed all the carpet in the car and had to unbolt and retightned the seat belt mount, so I know it was fine then.
Its only till a few weeks ago when I went to unbolt it, it turned very easily, due to the fact it just ripped its self out of the sill!
The rear subframe and wishbones are good condition, so the corrosion is mainly around the driverside pillar and sill. It is a 1986 car, so one of the first.
Both are big MOT failures, and with the time and effort involved and the car needed a paintjob anyway, I decided to break it...