A steering damper is a bandaid fix..
And without assessing the underlying problem will wear out things much quicker..

Unfortunately there are a number of things that can cause the dreaded nissan death wobbles..

As above mentioned wheel bearings and possibly steering box..
But I'd check bearings first and box last..
In between you have rod ends on both drag rod and tie rod.
Bushes on panhard rod and radius arms..
King pin bearings.

And..
It could also be worn bushes in the backend.. note as often but has been noted, mainly rear panhard rod..
Imo if you do the bushes in the panhard rod do both of them.