K&N Custom air filter 56-1350 fits the following carburetors:

Mikuni-Solex 40, 44, 48 PHH
Weber DCOE 40,42, 45, 48
SK Racing

Product Specifications
Air Filter Height 3.25 in (83 mm)
Air Filter Inside Diameter 6.125 in (156 mm)

Height 3.25 in (83 mm)
Inlet Diameter 1.97 in (50 mm)
Mounting Hardware Included Yes
Neck Flange 1.969 in (50 mm)

Outside Length 7 in (178 mm)
Outside Width 4.5 in (114 mm)
Overall Height 3.5 in (89 mm)
Top Material Chrome
Top Style Metal

Product Box Height 6.75 in (171 mm)
Product Box Length 10.5 in (267 mm)
Product Box Width 8.38 in (213 mm)
Weight 1.3 lb (0.6 kg)

Replacement Filter E-3341