I've read a few things on here about the Boss tower arm (same arm as diywake and a few others)not fitting certain towers.
I didn't read that until it was too late and I already purchased one. I got to thinking, and this is only aluminum. So I mounted the arm, grabbed my map gas plumbing torch and heated the 5/8" rod for about 2 min and used the closed end of a 3/4" wrench to bend it. This only took about 5 min and turned out great. It looks like it came like that from the factory.
I just thought I'd post this because this is the best priced tower mirror arm and its an easy mod.
Here's a pic.