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The SuperPro rear spring insulator (+5mm thickness) for 1965 Triumph TR4A matches dimensions A=94mm B=67–85.5mm C=12mm D=5.5mm E=72mm and fits helical spring seats with a tapered ID. The thicker insulator provides additional spacing where needed to correct ride height or clearance. Made from durable polyurethane, it resists degradation, secures spring location and delivers longer-lasting performance than original rubber components.
SuperPro 1965 Triumph TR4A Base Rear Spring Insulator (+5mm Thickness)
