I used a two-part epoxy called "Plastic Weld" and mixed it as directed. (It sets very quickly and dries hard so you gotta move fast!) I set the piece in place and smoothed over the repair. You only have about 45 seconds to do this as it is hardening. It goes from clear to white as it sets. Once it dries in about 15 minutes, you can sand it and reapply it if you need to refill a spot.
Front view and rear view:
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