The replacement filter for the 56-9070 is the E-3322. E-3322 as are most of our round filters are flexible and able to be used in a round or oval form.

Product Specifications
Filter Material    Cotton Gauze
Height    2.5 in (64 mm)
Inner Wire    No
Inside Diameter    5.25 in (133 mm)
Outside Diameter    6.25 in (159 mm)
Air Filter Shape    Round
Package Contents    1 Air Filter

Product Box Height    6.63 in (168 mm)
Product Box Length    6.5 in (165 mm)
Product Box Width    3.63 in (92 mm)
Weight    0.5 lb (0.2 kg)

Another part number is E-2601 thats just 2.188 in (56 mm) high