You're right Howard, Daimler Chrysler and GM are diff car groups, and compeat with each other at that.
The dead give away is to go to www.gm.com and look for links to Daimler Chrysler brands, you won't find any
And the caddy in question uses a range of parts from the GM parts bin, Vette suspention, and either some form of 350V8 or the northstar.