I overtightened one of the throttle body bolts when installing my Mamo throttle body, and broke it. (I saw the post that said to torque at 88 - and assumed 88 ft-lbs.

No, it's in-lbs. Anyway - I imagine this bolt 11588744 can only be ordered through a dealer? I'm not seeing any at O'Reilly's, Auto Zone, etc.
I knew that the bolt didn't seem to be tight like it should, then on the way home from Minnesota today I punched the gas pedal to pass some cars on the interstate, and the car wasn't pulling like it should. Another blast later confirmed that it was running pretty rough in the upper RPM's. Before it finally broke completely, the Mamo was doing its job - the car was definitely pulling harder than it did with the stock throttle body.