Ok guys ... got the details:
The Lanos and Aveo thermostats are interchangeable.
At the Chevy dealer, after tax, the Aveo one was $17.17, but for the plastic one just like on my Lanos. The same kind that break.
The metal one for the '07 Aveo, after tax was $83.44.
The day after my thermostat broke, I repaired it so it could be used until the new one arrived; here are the pics:
http://www.totalglobaldomination.org/da ... hermostat/
I have the new one, but have not yet installed it, so for now, I am driving with the repaired one in place.
If the repaired one breaks, I have the new one, pliers, wrenches and pre-mixed coolant in the car so I can do a side-of-the-road repair if necessary.
Cliff