Fit for: For Peterbilt Specifications: OE Number: Q21-6119 Product Material: Plastic, Metal Number of Pins: 8+16 Pins Features: *Direct Replacement This HVAC control module is designed to match its original equipment for better performance. *Functional Testing All products were tested for performance and to ensure the accurate parameters for your vehicle. *Simple Installation Advanced vehicle knowledge is not required for proper installation and replacement. *Matching Design The module design is similar to the old one, so it can match the vehicle seamlessly. *Warm Notice .