You might be able to see from my pics that the whole rear section (seat back) was hand made narrower than original specs. When I lift off the seat (attached by velcro) it's impossible to get to the screws to unscrew the plastic cover thing. About 8-10 bolts hold down that rear section, but it's still a pain to remove.
Thanks Hanso for the other filter option. I'd probably want them under the bear claw. Do they still work efficiently under the bearclaw?