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Most if not all of the modern replacements are too tight right out of the box. What I've done when replacing Mercury car bushing & bolt assemblies is put the seals in solvent overnight. They grow a good bit. The only problem is that they shrink back up after they dry out. I don't soak them till I'm ready to assemble and assembled them wet. It works for me anyway. Stoddard solvent or naphtha based solvent should both do the trick.