No, the SE uses a short shock. 4.75 E2E.
Vintage Cannondale – Rear Swingarm and Rear Shock Information | VintageCannondale.com
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I may have a beater 4.75, I can look around. Liquidating almost everything.
All good, it would just be nice to see it restored. My plan was to make a Omega clone with a rock shox front, but sold my RS-1.