spike in +2 seat frame

[vortz]

can anybody tell me why i have a 10 inch spike, inserted into the rear of both my front seat frames.
i have owned the car 8 years, and only discovered these when i removed a seat to repair it, at the weekend.
thanks ian (puzzled)

[tcsoar]

Ian,

It is common for these seat frames to crack and break at the back of the frame, maybe these spikes were added to give the tubing some extra strength.

I can add that both of my seats had failed at this point and I inserted a turned down bolt to fit snuggly in the tube and welded them in place as well as the crack in the tube.

Chris.

[vortz]

chris
thanks for the reply.
although it`s a good theory,I don`t think that is their purpose.
they slide quite easily in and out of the seat frame.
If I had to guess, I would say they are to line something up with something else.
they definitely don`t add lightness,so they can`t be OEM.
ian