Thought this photo may help:

Stage 1 - the 'ring' sealing and holding the filter in place (snorkel removed)
Stage 2 - the filter itself under the 'ring'

Kevs fuel mod sat above the stage 1 'ring' and sat in a diy holder.

Stage 3 - air filter element and cover which replaces one of the airbox side covers - not fitted on mine so no photos.

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