K&N Is by far the best made, the best performance and the most desirable filter available. NZ Air Filters Online has a good range of sizes and shapes available.

Part RU-0950 Product Specifications
Flange Inside Diameter: 2.75 in (70 mm)
Flange Length: 0.625 in (16 mm)
Flange Offset: 0.438 in (11 mm)
Flange Type: Offset
Height: 4 in (102 mm)
Outside Diameter: 5.5 in (140 mm)
Top Style: Rubber
Top Material/Finish: None
Filter Material: Cotton Gauze
Flanges: 1
Filter Re-Oiling Amount: 0.77 oz (23 ml)
Inner Wire: No
Weight: 1.2 lb (0.6 kg)