I bought a pair from Amazon and replaced my worn out ones in about 5 minutes. If you don't have someone to help hold it up when you take the old ones off, you might want to be prepared with something like a broom to keep it from slamming shut on you. I'd be weary of used ones when new are fairly cheap. With Prime from Amazon, they were $17.99 https://www.amazon.com/Maxpow-Compatible-Tailgate-Supports-Dampers/dp/B00NGHLY4U