Feature: 1. Fitment: This rear brake master cylinder is custom engineered to fit specific vehicles. Replacement for ATC200X 1983‑1985; Replacement for ATC250R 1983‑1984; Replacement for ATC350X 1985‑1986. 2. OE Numbers: 43500 HA5 671, 3500‑964‑006, 43500‑964‑016, 43500‑965‑006, 43500‑965‑016, 43500 HA5 006, 43500 HA5 016 are the reference part numbers. 3. Enhanced Braking Performance: Meticulously engineered to deliver optimal braking performance, the rear brake master cylinder provides a sure and responsive braking experience, contributing to increased safety on the road. 4. Exceptional Durability: Constructed from metal materials, the rear brake master cylinder is engineered to withstand the high demands of braking systems, ensuring reliability and longevity. 5. Direct Replacement: Designed as a direct replacement for the original equipment, the brake master cylinder eliminates the need for modifications, making installation swift and convenient. Specification: Item Type: Rear Brake Master Cylinder Material: Metal OE: 43500 HA5 671, 3500-964-006, 43500-964-016, 43500-965-006, 43500-965-016, 43500 HA5 006, 43500 HA5 016 Fitment: Replacement for ATC200X 1983-1985 Replacement for ATC250R 1983-1984 Replacement for ATC350X 1985-1986. Package List: 1 x Rear Brake Master Cylinder Note: 1. Please verify the OEM number and fitment before purchasing. 2. Professional mechanic installation is highly recommended.