I have been using that same filter for years. I found great covers at JCWhittney.com They fit over the filter snuggly and have a set screw to help hold them if you feel the need...I do not use the set screw. They look great and mine are now 8 years old. Also very inexpensive.
If you go here you can see them on the engines I had in my 32 Fountain. http://www.speedwake.com/photopost/s...php?photo=4070