Tim,
You can use universal replacement mufflers from just about anyone. You'll need to measure your mufflers case size, pipe size, and note how the input and output pipes are configured. (i.e. offset inlet, center outlet) Once you have this info, you can look into any products that will fit from a number of places. (google 'muffler') Getting everything to line up and fit can take a little work, but most muffler shops are pretty good at handling this.
