i just measurd the filters to figure out how much i wanted to expose then marked thet distance up from bottom edge on bearclaw where the three domed bits r .
then i got some cardboard and traced around the exact shape at the bottom of one of the domed bits cut the shape out with the scissors and used it as a template at the spots i had marked .
joined them up freehand and cut the claw with tinsnips and cleaned the edge up with some grinding - sanding stones on my drill.
i also have some black edge trime coming that i purchased on ebay to dress it up a little.
i am currently using the K&N RU-2780 filters and if u turn them on a 45deg angle to the right the line up nicley with the claws. also just be careful not to cut away any of the part that covers your coolent overflow.
hope this helps
just remember if u get it wrong u can always get a new one
regards mitch