What are the measurements of the openings on 89L047?

Product Description: 1979-85 Mustang Air Cleaner Intake Tubes - Each

Measurements:

Inner diameter of circular opening: 3-7/16"

Rectangular inside measurement: 3-3/4" x 2-1/4"

89L047

For more information, follow the link: 1979-85 Mustang Air Cleaner Intake Tubes - Each