Equipped with heavy duty cooling option.

Ebay, craigslist, your local mechanic might have some 'local' sources.

I would check yahoo local for a u-pull it in your area. Most of the ones in my area will give you a hollander interchange print-out showing every year and model in all G.M. divisions that fit your application. I went looking for a pontiac sunbird wiper motor and found it on a cadillac seville two years newer. Or you could try this link:
http://www.valuparts.com/search.html