I have these 2 air breathers top, bottoms and 2 new old stock air filters, trying to identify what year and model they are off from, I did search but can only find the raised top ones.
the dual quad set up's are a little different with indentures and such....really think the plain top's are off a standard single 4 barrel set up.....filaments/filters the same.....
Those housings are more than likely single quad which are deeper than the 1958,1959 & 1962 dual quad housings. Also the dual quad housings for the later has a flat side for clearance between filter housings.