Has anyone used a wheel spacer to fill in the rear wells on a Duster?

ckjarr said
View attachment 1715403110 @lilfontleroy

I am unsure of the technical differences. It’s my understanding that picture one in your post is just a spacer. Picture two would be an adapter if you were changing bolt patterns but could also just be a spacer if you just needed the extra thickness. These are 2” spacer/adapters that are hub centric. The notice there is no “lip” for the hub of the wheel to center and rest on in the pictures in your post.

Technical difference: one is a very basic and simple spacer, the other has studs and is inherently safer. They make adapters that are same/same bolts pattern, so basically a spacer with studs. If you are not changing stud length then a regular spacer under 1/2" is ok, if you are looking to go wider than that, and are set on doing this with some type of spacer, then an adapter would be the way to go.