Ferrari made a small series of Super cars in the late 1950s. The larger engines required a larger filter element and a different tag was used. This one has the word “RETEX” (net or filter) in the center of the top line. Super America crescent-shaped air cleaner tag.
The late 275 GTB/4s and 330s used a new type air cleaner assembly with four “snouts” on the sides replacing the perforated steel side panels. These air cleaners used a large rectangular blue F.I.S.P.A tag. These are 92x35mm with 67mm hole spacing. These and all of the earlier tags are attached with small aluminum or steel round-headed hand-bucked rivets. The very early tags on the “Ram’s horn” castings were attached with “U-drive” or “Drive screw” type fasteners. Rectangular F.I.S.P.A air cleaner tag for 275/330/365s