You can increase the depth of these by using a plastic/nylon spacer fastened to the origins:~
Cut the above to shape & roughen the backs as well as the face of the existing part, glue the new part on with J.B.Weld- tape into place allowing it to cure as mentioned on the packaging.. areas must be keyed.. the weld will slump until it starts to cure but can then be moulded before it hardens.
Bob.
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