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The SuperPro rear spring insulator (standard thickness) for 1965 Triumph TR4A fits helical spring seats with a tapered ID and specific dimensions A=94mm B=67–85.5mm C=7mm D=5.5mm E=72mm. It stabilizes the spring seating and prevents movement common with old rubber insulators. Constructed from engineered polyurethane, the insulator resists sag and softening, preserves alignment of the spring, and improves long-term suspension consistency and reliability.
SuperPro 1965 Triumph TR4A Base Rear Spring Insulator (Standard) Thickness)
