Are you possibly referring to Sumo Springs. If so I installed them on the rear of my 23TR and it made a huge difference with sway from passing/meeting trucks to driveway curbs. I paid to have them installed. Took about 30 minutes and $80 If I recall.
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2017 Gemini 23TR Ford chassis w/ power stroke 3.2
DW, Daughter and 2 dogs, Sofie (black lab/boxer) and Phoebe (schnoodle)
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