This is the instrument pod used on the center of the dash pad that housed a tachometer & oil pressure gauge. It will fit any 1965 & 1967-1968 Mustang that wants that Shelby look. 1966 must trim to fit. Gauge openings are approximately 3-1/2" I.D. & 2-3/8" ID. The openings must be trimmed out. Comes in black injection-molded plastic, like all GT350 interior were, but you can easily paint it to match other colors if you desire.