Fiat 1100 Guibo issue

[georgeramos]

I ordered one of these to replace the totally crumbling guibo in my 1100R.

http://mrfiat.com/fiat-1100-1200-1500-c ... joint.html

On the ends of all the holes this piece has little "flanges" which sit proud of the surface. The original was totally flat on the ends. I believe this is causing a problem and would like to know if my theory makes sense. When I install and tighten the new one these little flanges create "bows" that alternate in direction so the entire thing is zig zagged as it travels around.

I cannot for the life of me understand why the part would be made this way so I am second guessing my theory.

The installation is exactly like a Spider, the bolts alternate side to side and there are longer ones on one side than the other.

Does my theory make sense or am I doing something else wrong?

Mr Fiat also has this one which IS flat at the holes but Ive never seen one like this before...

http://mrfiat.com/fiat-1100-flexible-joint.html

Thanks