Just replace the back part. It is only like 145.00 from cat then just drill out old rivets and rivet new one on. The rivets probably came loose on the rear footrests.
I would recommend buying or borrowing an air rivet gun. I changed out my extension and there are way to many to put in by hand. I bought the cheap one at princess auto and it worked great. There are couple different sizes and lengths that you need but I don't remember exactly what they are.