alternatives to >$120 replacement clock for old Magic Chef gas range
One way I have fixed things like this is to form new tabs out of metal parts. Have the new tabs bend down inside the back side of the plastic bezel piece where you use a good two part epoxy to glue the metal part in place. 

For where the plastic tab may still be intact you can add a thinner metal piece and glue into place in the same manner to strengthen the remaining part.

I've had really the best luck using copper plate material for this because it is easy to work with and bends nice without cracking like aluminum does. Soft brass plate works too but is harder to work with. Use steel wool to clean away tarnish to allow the epoxy to stick better.