The unifilters we use in our airbox's are manufactured to suit our airbox's.
They are also servicable, which means you can wash and re-oil them.
Please ensure to read the instructions provided by unifilter for how often the need to be washed and instructions on how to wash and re-oil them.
Step by step guide:
http://unifilter.com.au/contents/media/Unifilter%20foam%20air%20filter%20servicing%20guide.pdf
Youtube Clip: