Turns out the probax's are not quite the same size as the standard seats despite looking like identical in shape. After a couple of hours with various sharp and pointy tools I eventually got the seats to fit the subframe. However, while I can now get the front holes of the subframe to line up with the holes in the car, the rears are not even close! There are a couple of spare holes in the car that look like they might be for a different subframe.
Do I need the probax subframe and will it then bolt right in?
Also with the harness bar and probax fitted the seat doesn't go back as far as before. I can just about get away with that but I suspect it's because the seat needs tilting up a bit also.
Anyone done this before?