Cts 3.0l RWD compatible engines?

Quinnt97

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What vehicle(s) do you drive?
Cts 3.0 RWD
Few questions..

What other year Cadillac engine will fit directly into a 2010 cts 3.0l RWD(auto)?

And are there any good sites and/or forums that are legitimate to buy a used engine from? Craigslist and car-part is a no go, I can’t find anything.
 
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