Yeah, I broke one of those bolts too. I just went to the local hardware store and bought some 2 1/2 inch bolts, nuts, and washers. Put a washer on the bolt, put it on, put on the spring, another washer, then the nut, and good as new! I works just like the stock set up, and cost all of $2.00.
I bought 7/16 bolts, so they are nice and thick to deal with the stress put on them by the flexing exhaust.
