Highlander. A pleated and flexible protective device used over bare metal that collapses and expands with travel. Coil Spring Insulator. Coil Spring Insulator. Dust cover. Dust seal. DUST SHIELD. INSULATOR, FRONT COIL S. Protect tube. Shock cover. Spring seat. Strut mount retainer. Suspension Strut Bellows. Upper insulator. Upper seat.