Yep. Crutchfield is the way to go.
Most likely will need idatalink Maestro setup to retain all oem features.
Hope you're not a newbie to installs because it can appear daunting if installing an entire system.
But for a head unit only....just take your time and read and follow the install and setup instructions.
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
If you go to Crutchfield.com they have two different interface cable harness on the base system or if it has the HK amp unit. Somewhat plug and play but be mindful that each head manufacturer may have addtional instructions regarding installation.