Applications for 56-1320 is Dellorto DHLA 40,45,48 Carb

Note that these here apparently fit Dellorto DHLA 40,45,48:
56-1310, 56-1320, 56-1330, 56-9345

Product Specifications
Mounting Hardware Included    Yes
Replacement Filter    E-3341
Top Material    Chrome
Top Style    Metal

Overall Height    3.5 in (83 mm)
Outside Length    7 in (178 mm)
Outside Width    4.5 in (114 mm)
Inside Length    7.072 in (180 mm)
Inside Width    4.572 in (116 mm)
Weight    1.3 lb (0.6 kg)

Product Box Height    6.75 in (171 mm)
Product Box Length    10.5 in (267 mm)
Product Box Width    8.38 in (213 mm)

More about K&N Custom Assemblies see K&N Assemblies: