wheel studs have a look

610-103 is the dorman part # for the rear studs on your Duster. The knurl diameter is listed @ .673. I don't see another choice with a bigger knurl in a 1/2" - 20

You might want to have them tack welded in like Steve mentions as long as they fit snug in the axle.

Also, just so you know, the front & rear studs are different.