Fox shocks take a spring with an inner diameter of 1.38 inches. The Vivid requires a larger spring with an inner diameter of 1.5 inches. For this reason, the Fox spring wont fit on the Vivid.
As mentioned, the Avalanche and Romic shocks use(d) the same size as the Vivid, but in all reality it will just be easier to get a new Vivid spring (avalanche is a really small company, and Romic stopped making shocks about 5 years ago).
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