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
In the early 1950s the “street” cars used three of the two-barrel Weber carburetors. The air cleaner assemblies were supplied by F.I.S.P.A with a small aluminum F.I.S.P.A tag riveted to the tops. Two-Barrel early regtangular F.I.S.P.A air cleaner tag.