The Zenair factory mount for the fine filter used with both ULPower and Rotax 91xiS engines is made from two strips of aluminium.  

For those wanting something a bit more robust, Metal Seagulls off a P clip fixation, using 2 large P clips (Around the filter) and 2 small P clips (around the engine mount tube)

Should you need or desire a better mount, we have got it ready for you!

Kit includes 2 large and 2 small P clips with bolts, nuts and washers.

Photo for illustrative purposes only.... FUEL FILTER NOT INCLUDED  - available to here here: Bosch Fuel Filter