Correct wall thickness tube, Correct end form and shape This is the breather tube that fits in the 427 air cleaner base This fits the Open Air Cleaner bases that use the AC A212CW filter - 427 version or 350 LT-1 68-9 Camaro Z-28 air cleaner assembly 6423272 takes this same tube. The air cleaner base that this fits into is 6422188. zelle 4%+paypal