hey guys,

i'm new to this field and i've been wanting to learn how to mould and create parts for my car. for my first project, i decided to make a copy of the fog lamps frame for my corolla (circled in red).



since i already have a rubber mould, how do i go about creating the back portion of the part where the bolts for the foglamps frame are mounted?

by the way, below are close-up pictures of the frame for your reference.

front:


back:



rtv rubber mold:


thanks so much!