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Specialities include: Automotive Mechanic, Small Engine Repairs, Auto Body Repairs, Diesel Engine Repairs
Hi Im Scott I can help with your question.
You are correct the Idler pulley (or back idler pulley or Air conditioning Idler pulley) is the one on the right lower side of the engine. It is readily available after market.
Here is a company in Australia who is a major supplier of these after market
http://www.dayco.com.au/products.aspx?G=1787&P=1520
or in the U.S
http://www.vsm.skf.com/en-US/Automotive/Engine/IdlerPulley.aspx
The Genuine Holden Part Number is 92094003. I am unsure of the after market part number as they vary depending on the supplier but the above websites should put you in the right direction.
P.S its nice to see someone referring to a Buick as a Holden Commodore
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Ellen
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