Just picked up a Dorman expansion plug for $5. Size 3/4 - 7/8, fits perfect into the air box. Had to adjust the nut to expand it a little for a nice tight fit. Washer is large enough that it won’t get sucked in.Measure inside ID of hole in you intake tube and match it up.......I don't remember exactly but may be 7/8".....they have different sizes in blister packs!!