where are you located? Alaska?
I cracked the lens on my SWM M10R a while back and replaced it with a plastic one that i bought on dealextreme. i got a pack of like 3. i have 2 to spare. it fits the diameter but is a tad too thick, so the bezel doesn't screw on like all the way. i mean it screws on, but there's a fraction of a MM gap.
anyhow, if shipping is not a big pain in the ***, i'll just mail you a spare. shoot me a PM.