The Stainless Steel 15 Inch Regular Donaldson-Style Air Cleaner Housing is a practical and reliable product designed to improve air quality in your vehicle. With dimensions of 15" (W) x 33" (H) x 7" Inlet, it fits most Kenworth and Peterbilt models effortlessly. The four nuts on the top flange ensure a secure and durable construction. Additionally, the option to purchase Peterbilt or Kenworth bracketry separately adds versatility. Please note that filters are not included, but compatible filter part numbers are provided for your convenience. While it fits most models, slight modification is required for 359 models.