It's been awhile since I've had mine off, but it seems like it would be pretty easy to make a replacement if you can find some thin rubber or plastic, maybe aquarium tubing that you cut a strip out of.
Or get some cork gasket material, trace around the lens and cut one out. Beats the he!! out of dealer cost.
Hey! I may have something in my junk box that'll work, let's see if we can coordinate schedules.
