I believe it has coil springs. I’m not 100 percent on that, but from what I’ve read the base model DeVille does not have air springs.
After replacing something like this is the wheel alignment necessary and/or a good idea?
It may take me some time to find a garage that will do this for me, I’ve been to a few different places in town for other repairs and each one seems very stingy with their time and willingness to show rather than tell. In most cases they only want me to pay.