This set is, essentially, three small based air cleaners from the small center carb of the 57 / 58 to the two smaller outer carbs. Show Quality, mirror chrome. Excellent reproduction. Included in sets ,three bases, three paper elements, three chrome lids, three bottleneck studs, three correct air cleaner gaskets. I no longer include the chrome wing nuts due to the increased cost. Chrome wing nuts are available on the web site. NO disappointments. Also fits 348 tripowers and Olds J-2