Yeah, the exact same thing happened to me to my tranny mount. Its part of the assembly that the stock air bracket connect to. (via little rubber nuts) Its really easy to fix.
Keep the big-huge rubber grommet and the black thing that goes through the middle of it. You can unscrew the broken bolt from the black thing by grabbing it with some vise grips and unscrewing it. Go to the hardware store with the broken bolt you extracted and buy a replacement bolt with same thread count. I got mine from Ace Hardware. And they had an exact replacement on hand, same length,strength rating, and everything. (God was encouraging me that day)
When I re-installed it, I used a jack with a 2x4 on it to jack the engine back up to be able to put everything back together. (because when this mount breaks, the tranny sags downward)
Hope that makes sense and helps out...