Quality costs, how much are you willing to spend?

Here are a couple of my favorite online sellers:

http://www.blueskycycling.com/cat-cr.../group-312/1/n Race face arms, usually $180 for $69. Might be overkill and might not fit your bike.

http://www.pricepoint.com

There are other places. Just a couple places to start. Get some riding in and see if the problem returns. I'm hoping it was a "UNIQUE" failure.