I have another G that is a decade younger and solar powered. Worst comes to worse, I can use that one. Display is smaller on the newer one. It looks like bezels are available for <$20 to replace the disintegrated one too. As I only use this for diving, I'm not sure I'll bother.
If you like the size of the display on the 6600 and would prefer to use it get the bezel. You won't be starting/stopping/changing modes/setting if you look at the exposed pushers wrong.