Ahh the lovely Deathwooble.
Let me start with a steering stabaliser/dampner when worn out will NOT cause DW, but a new one will help mask it. I helply recommend you look to fixing the DW before simply fitting a new one.
Likely culprits are:
Wheel balance out.
Incorrect alignment (usually the toe setting is the culprit - but don't ignore your caster setting either).
Worn/damaged tierod or draglink or panhard (tackbar) ends.
Loose trackbar (eg broken bolt).
Bent tierod/draglink (will usually show in incorrect toe settings).
Worn/damaged hub bearings.
Hope that helps.
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