I had the template laser cut out of 3mm S/S...
From the Website:
Universal Water Filter/Strainer Kit protects your intercooler from damage & reduced efficiency due to waterborne debris such as sand, seaweed, grass and pebbles that are sucked into the cooling system. Oversize "Super Strainer" mounts easily inline with cooling system and features clear filter cup for quick visual inspection. Kit includes large high quality marine strainer, stainless steel mounting bracket and a selection of adapter fittings to match Yamaha, Sea-Doo & Kawasaki applications.
Can buy from here: